Crossword Genius

Short holiday beware is up, finishing early (3)

Ross

I believe the answer is:

vac

'short holiday' is the definition.
(abbreviation for vacation; 'short' suggests a short form)

I can't explain the remainder of the clue.

(Other definitions for vac that I've seen before include "short holiday" , "which helps with housework" , "brief holiday" , "Break" , "Holiday; cleaner" .)

I've seen this clue in The Times.
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