Crossword Genius

Prisoner to fall behind (3)

Ross

I believe the answer is:

lag

This clue is a double definition.

'prisoner' is the first definition.
(slang term)

'to fall behind' is the second definition.
('lag' can be a synonym of 'fall behind')

(Other definitions for lag that I've seen before include "Wrap to protect from frost" , "Protect from cold" , "Dawdle" , "Fall behind with gal" , "Delay" .)

I've seen this clue in The Mirror.
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