Crossword Genius

Fight a big-headed brute (3)

Ross

I believe the answer is:

box

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'fight' is the definition.
(boxing is a kind of fighting)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for box that I've seen before include "Punch" , "Spar; tree" , "Engage in pugilism" , "Topiary shrub" , "Receptacle" .)

I've seen this clue in the Evening Standard.
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