"Thrilla in Manila” champ (3)
I believe the answer is:
ali
'thrilla in manila champ' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ali that I've seen before include "Old fighter" , "Muhammad ..., former boxer" , "Muhammad - - , legendary boxer" , "A champ'" , "Ring' specialist" .)