Crossword Genius

Invitation to arrest an outpouring (3,4)

Ross

I believe the answer is:

say when

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If this is the answer, I'm afraid I cannot explain it.

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(Other definitions for say when that I've seen before include "Words from the pourer?" , "Tell me when to stop pouring" , "Request to be told to stop pouring drink" , "Pourer's words" .)

I've seen this clue in the Evening Standard.
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