Jaecheop-guk ingredient (4)

I believe the answer is:

clam

(Other definitions for clam that I've seen before include "Large bivalve mollusc" , "Large shellfish with hinged shell" , "Secretive person - mollusc" , "Proverbially reticent marine mollusc" , "Mollusc, one proverbially reticent" .)

I've seen this clue in the USA Today.

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