Crossword Genius

Become closemouthed (4,2)

Ross

I believe the answer is:

clam up

(Other definitions for clam up that I've seen before include "Refuse to speak" , "'Fall silent and refuse to talk (4,2)'" , "Refuse to talk like large shellfish?" , "Keep mum" , "Abruptly stop talking (colloq.)" .)

I've seen this clue in the Universal.
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