Crossword Genius

Boxer’s a bit of fat around the waist? (12)

Ross

I believe the answer is:

middleweight

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'boxer's' is the definition.
(middleweight is a kind of boxer)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for middleweight that I've seen before include "Boxing category" , "Boxer" .)

I've seen this clue in The Times.
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