A sand-burrowing bivalve mollusc of the family Cardiidae (6)

I believe the answer is:

cockle

(Other definitions for cockle that I've seen before include "Edible bivalve mollusc" , "Seafood item" , "Common edible bivalve" , "Mollusc - cornfield weed" , "Shellfish" .)

I've seen this clue in The Independent.

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