2001 Will Smith movie
I believe the answer is:
ali
'2001 will smith movie' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ali that I've seen before include "Muhammad ... (former fighter)" , "Mohammed . . . (boxer)" , "Muhammad ..., former boxer" , "Cassius Clay became Muhammad ..." , "girl shortly" .)