Crossword Genius

Dollar, informally (4)

Ross

I believe the answer is:

clam

(Other definitions for clam that I've seen before include "Burrowing marine mollusc living in sand or mud" , "Shellfish - secretive person" , "Quahog" , "Large shellfish with hinged shell" , "reticent person" .)

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