Possible Clues:

• Hit 1989 biographical play
• 1989 one-man Broadway drama
• 1989-90 Broadway play
• "___ dat" ("agreed")
• Mr. Capote to friends,
• Biodrama about Capote
• In Cold Blood penner, to pals
• One-man show set in 1975
• Play set in Capote's apartment
• Robert Morse Broadway role