Dog possibly sitting in the corner? (5)

I believe the answer is:

boxer

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

I can't explain the remainder of the clue.

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

I've seen this clue in the Evening Standard.

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