Comic character with only one sock (5)

I believe the answer is:

punch

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

I don't understand the rest of the clue.

(Other definitions for punch that I've seen before include "Hit with a fist" , "Strike, Judy's husband" , "Press" , "Spirit-based drink" , "Hook, maybe" .)

I've seen this clue in the Evening Standard.

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