Crossword Genius

Edible mollusc (7)

Ross

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4

5 6 7

(Other definitions for clam that I've seen before include "Large marine bivalve" , "shy person" , "One is as uncommunicative as a mollusc" , "A silent type" , "Tightly closed shellfish" .)

I've seen this clue in The Sunday Times and The Mirror.
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