"The Greatest" boxer (3)

I believe the answer is:

ali

'the greatest boxer' 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 "Champion boxer" , "Mohammed . . . (boxer)" , "Fourth caliph of Islam" , ""The Greatest" boxer" , "Muhammad ..., former boxer" .)

I've seen this clue in the Jonesin Crosswords, the Family Time, the L.A. Times Daily and the USA Today.

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