Crossword Genius

Warning not to leave (3,4)

Ross

I believe the answer is:

you wait

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'warning' is the definition.
('just you wait!')

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for you wait that I've seen before include "Words of warning" , "When service is slow" , "Threat" , "take your turn" , "there will be trouble" .)

I've seen this clue in The Guardian.
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