Burrowing bivalve mollusc such as the quahog (4)

I believe the answer is:

clam

(Other definitions for clam that I've seen before include "Large bivalve mollusc" , "Reticent shellfish?" , "Shellfish - secretive person" , "Mollusc with firmly-closed shell" , "Large marine bivalve" .)

I've seen this clue in The Mirror.

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