Fighting dogs? (6)

I believe the answer is:

boxers

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'dogs?' is the definition.
(boxer is a kind of dog)

I can't explain the remainder of the clue.

(Other definitions for boxers that I've seen before include "Pugilists or men's underwear" , "Craters" , "Men's shorts for pugilists" , "Dogs; packers" , "Dogs or men's loose underpants" .)

I've seen this clue in The Guardian and The Globe and Mail.

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