Crossword Genius

Boxer who gets his opponents livid? (7)

Ross

I believe the answer is:

bruiser

I'm a little stuck... Click here to teach me more about this clue!

'boxer' is the definition.
(thesaurus)

'gets his opponents livid?' is the wordplay.
I cannot quite understand how this works, but
'gets' could be 'is' (I've seen this in other clues) and 'is' is found in the answer.
This explanation may well be incorrect...

'who' is the link.

Can you help me to learn more?

(Other definitions for bruiser that I've seen before include "Strong aggressive person" , "Fighter - rues rib (anag)" , "Fighter -- bully" , "Informally, a large tough person, maybe a boxer" , "Big aggressive man" .)

I've seen this clue in the Evening Standard.
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