Illegal weapon — curt Ken sulked (anag) (7-6)

I believe the answer is:

knuckle-duster

(Other definitions for knuckle-duster that I've seen before include "Weapon worn on the hand" , "Illegal hand weapon" , "Weapon attached to the fist" , "Hand cover used in fist-fighting" , "Thug's hand-held weapon" .)

I've seen this clue in The Guardian.

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