Possible Clues:

• ''Cato'' playwright
• Derek's ex-wife on "Grey's Anatomy"
• A churchman is willing to have been an essayist
• Willis's "Moonlighting" role
• Writer is featured in supplement
• Poet and MP is an odd combination
• A divine one is willing to essay some work
• One of Richler's characters giving an elevated performance?
• Put one more on, my boy, to be an essayist
• Spectator's patron is captured by an accessory