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Sort who refuses to answer (4)

Ross

I believe the answer is:

clam

(Other definitions for clam that I've seen before include "Large bivalve mollusc" , "Reticent shellfish?" , "What could grip" , "Mollusc with firmly-closed shell" , "Burrowing marine mollusc living in sand or mud" .)

I've seen this clue in The New York Times.
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