Crossword Genius

Pen St (4,2)

Ross

I believe the answer is:

shut up

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'pen' is the definition.
(thesaurus)

I can't explain the rest of the clue.

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(Other definitions for shut up that I've seen before include "Button it!" , "Imprisoned" , "Keep mum" , "in prison" , "Rude order to stop speaking" .)

I've seen this clue in The Sunday Times and The Times.
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