GOOD MORNING: Marcia Clark has signed with the William Morris Agency. Clark, attorney for the prosecution of O.J. Simpson, will be represented by WMA in all areas. … WMA chairman-CEO Norman Brokaw will head a team of Morris literary, motion picture and TV agents to guide Clark’s post-trial activities. When I asked Brokaw whether “all areas” would include pay-per-view television, he replied, “Absolutely not!” … Will Clark remain with the D.A.’s office? “I am at the crossroads in my life and I’ve made no decision about my future,” she said. When asked what she believes people should come away with from this experience, she said, “It’s really too soon to tell, or to jump to any particular conclusion. Time is our friend and will allow us to take advantage of the unique opportunity this case has offered to us, to reflect, to mend, and ultimately to shore up the strength of our institutions and to address their weaknesses in a constructive and positive way”… As expected, she’s been bombarded with opportunities. She said her phone pager went into overload Thursday. Mark Fleischer, Clark’s personal/legal adviser, spokesman and friend, said he and Clark “are happy to have the counsel of Brokaw and the WMA.” Clark came to Fleischer when he was at the law firm of Manatt, Phelps & Phillips. She was in the midst of seeking dissolution of her marriage from Gordon Clark. However, on June 12 of this year, Fleischer departed the law firm to become senior VP/deputy general counsel at MGM, and Judy Forman became Clark’s divorce lawyer. Clark told me nothing’s resolved in the divorce case, custody (of their two children), support or division. “Everything I do now” for Clark, Fleischer said, “is not in any official capacity at MGM — but just to be her private adviser.” He was with her Tuesday immediately after the verdict … A book by Clark is among the projects Brokaw will organize. Brokaw said, “I am honored to be representing one of this country’s most significant legal talents. In the past eight months Marcia Clark has not only demonstrated her immense skill to a worldwide aud, but truly and fairly won our hearts with her dignity, tenacity and style.”A PERFECT TIME FOR ANOTHER TRIAL: Abby Mann, Emmy winner for “Indictment: The McMartin Trial,” is readying an HBO film on the Julius and Ethel Rosenberg trial , and also is prepping a legit version of his 1961 Oscar-winning screenplay of “Judgment at Nuremberg.” He wrote “Judgment” for “Playhouse 90.” Max Schell won an Oscar in the all-star movie, and Schell now wants to play the Burt Lancaster role in the play — which Schell also would direct on Broadway. Gregory Peck is hoped for in the role previously played by Spencer Tracy. Mann reminds that the movie script lends itself perfectly to the stage. Mann believes the Rosenberg trial “is the real case of the century — more so than the Simpson. Its importance was felt through all of the Cold War.” Mann admits he hasn’t yet decided whether he believes they were guilty or not guilty. On Oct. 16, Mann receives the L.A. Film Teacher Assn’s. Edward R. Murrow Responsibility in TV Award at the Sportsmen’s Lodge. It’s for his work, including “Judgment, “”McMartin,” “King,” “The Marcus-Nelson Murders,” “The Atlanta Child Murders,” etc. Schell wings in from Europe to make the presentation. The Manns will not move back into their house, which was torched — on the first day he went to the set of his “McMartin” movie. Government agencies continue their investigation … At the Film Teachers Assn. ceremony, Rod Steiger receives their Jean Renoir lifetime achievement award. Pal John Goodman makes the presentation … Latest addition to the U.S. Postal Service’s Literary Arts series is Tennessee Williams. A commemorative stamp is issued Oct. 13 in his boyhood hometown of Clarksdale, Miss., in a ceremony near St. George’s Episcopal Church, where Williams’ grandfather was rector. Williams, his mother and sister lived in the church rectory. The stamp, with Tennessee in white suit with a streetcar in the background, was designed by Michael Deas, who also designed the Marilyn Monroe stamp. It’s based on a never-published photo by Jack Mitchell. A NEW MILESTONE FOR Sidney Sheldon, who has sold more than 200 million books: His “Nothing Lasts Forever” (Warner) is the No. 1 bestselling paperback, and his hardcover “Morning, Noon & Night” (Morrow) debuted at No. 2 in Publishers Weekly and the New York Times. His “Nothing Lasts Forever” airs on CBS as a mini, and next month Sheldon is exec producer on “Morning, Noon & Night’ as another CBS mini, with Von Zerneck/Sertner Films … Howard Olgin’s thriller “Lifebank” (Dell) has a 300,000-copy first printing. It’s a medical-themed hair-raiser about a femme surgeon and illegal sales of organs for transplant.