We accept the possible link with shellfish (6)

I believe the answer is:

winkle

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'shellfish' is the definition.
(winkle is a kind of shellfish)

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

(Other definitions for winkle that I've seen before include "A sea creature" , "Small shellfish" , "Sea snail" , "Small mollusc" , "Marine snail" .)

I've seen this clue in the Evening Standard.

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