Edible mollusc with a ribbed fan-shaped shell (7)

I believe the answer is:

scallop

(Other definitions for scallop that I've seen before include "Shapely dish" , "Shellfish - pilgrim badge" , "Shellfish - badge worn by pilgrims to Santiago de Compostela" , "Marine mollusc" , "one may be in one's shell" .)

I've seen this clue in The Guardian.

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