Crossword Genius

Zip it, with "up" (4)

Ross

I believe the answer is:

clam

(Other definitions for clam that I've seen before include "ringing noise produced by > very reticent type" , "What could grip" , "Reticent shellfish?" , "Mollusc, one proverbially reticent" , "Mollusc with firmly-closed shell" .)

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