Historic Harlem theater (6)
I believe the answer is:
apollo
'historic harlem theater' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for apollo that I've seen before include "Deity" , "US moon landing programme" , "Japanese dish" , "Greek god - US space programme dedicated to moon landings - butterfly" , "Greek god; large European butterfly" .)