One of the mollusks (7)

I believe the answer is:

scallop

(Other definitions for scallop that I've seen before include "Bivalve with radiating ridges on shell" , "Shell - sign of a pilgrim" , "Bivalve mollusc with fan-shaped shell" , "one may be in one's shell" , "Shellfish - pilgrim badge" .)

I've seen this clue in the Newsday.

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