Crossword Genius

Cockney dukes (5)

Ross

I believe the answer is:

fists

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'dukes' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

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(Other definitions for fists that I've seen before include "Doubled up hands" , "Boxer's punchers" , "Fighting tools" , "Dukes" , "Hands with fingers clenched" .)

I've seen this clue in the Evening Standard.
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