Didn't stay when dropped off? (4)

I believe the answer is:

left

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'didn't stay' is the definition.
(I've seen this in another clue)

I don't understand the rest of the clue.

(Other definitions for left that I've seen before include "choice at a junction?" , "not consumed" , "Socialist direction" , "quit" , "The sinister side" .)

I've seen this clue in the Evening Standard.

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