Crossword Genius

Steamer, e.g. (4)

Ross

I believe the answer is:

clam

(Other definitions for clam that I've seen before include "Mollusc with tightly-closed shell" , "Mollusc with firmly-closed shell" , "Edible shellfish" , "Large bivalve mollusc" , "shy person" .)

I've seen this clue in The Wall Street Journal.
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