Will Smith title role (3)
I believe the answer is:
ali
'will smith title role' 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 "Son-in-law to Muhammad" , "Mohammad . . ., . . . Hewson" , "Muhammad --, US boxer" , "Former boxing champion" , "Old fighter" .)