Grunts getting on with tattoos (5)

I believe the answer is:

oinks

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

I can't explain the rest of the clue.

(Other definitions for oinks that I've seen before include "Noises from pens" , "Piggy noises" , "Grunts" , "Beastly sounds" , "High-pitched pig noises" .)

I've seen this clue in The Sunday Times and The Times.

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