Famous Harlem theater (6)
I believe the answer is:
apollo
'famous 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 "Programme targeting satellite" , "Greek god of the sun (6)" , "handsome chap" , "Greek sungod, son of Zeus" , "mission of high-flying Americans?" .)