He's among the greatest ex-champions alive (3)

I believe the answer is:

ali

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'he's' is the definition.

I can't explain the rest of the clue.

(Other definitions for ali that I've seen before include "Son-in-law to Muhammad" , "US heavyweight boxer" , "Ringmaster" , "Muhammad ... (former fighter)" , "Lepidopterous floater, apian stinger, d. 2016" .)

I've seen this clue in the Evening Standard.

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