Crossword Genius

Stop talking (4,2)

Ross

I think it could be either:

Which length description are you looking for?:

4,2

4,4

clam up

'stop talking' is the definition.
(I've seen this before)

This is all the clue.

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

I've seen this clue in The Guardian, the King Feature Syndicate and The Telegraph.
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