You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: JACKs 
Clue: Explaining why he lost the heavyweight championship to Gene Tunney, he said, "I forgot to duck"
jack dempsey

Category: 10-LETTER WORDS 
Clue: (Jimmy of the Clue Crew in Seattle)  Used in "Hamlet", it's the common British term for the vendor I'm buying from
fishmonger

Category: THEATRE GHOSTS 
Clue: The man in this drab color who haunts the Drury Lane Theatre may the ghost of a man found bricked up in a wall there

gray