Will Smith biopic (3)
I believe the answer is:
ali
'will smith biopic' 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 "Lepidopterous floater, apian stinger, d. 2016" , "Cassius Clay became Muhammad ..." , "Mohammed . . . (boxer)" , "Champion of ring" , "Muhammad --, US boxer" .)