Dog with gloves on? (5)

I believe the answer is:

boxer

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'dog' is the definition.
(I know that Boxer is a type of dog)

I cannot understand how the remainder of the clue works.

(Other definitions for boxer that I've seen before include "Breed of stocky short-haired dog" , "Prizefighter" , "Tyson, perhaps - type of dog" , "Person assisted by a second" , "one that's accustomed to fighting" .)

I've seen this clue in the Evening Standard.

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