Crossword Genius

Zip your lip (4,2)

Ross

I believe the answer is:

clam up

(Other definitions for clam up that I've seen before include "Refuse to talk like large shellfish?" , "Go silent" , "'Fall silent and refuse to talk (4,2)'" , "Refuse to speak" , "Stop giving out" .)

I've seen this clue in the Sydney Morning Herald.
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