Crossword Genius

Mix in prison (4)

Ross

I believe the answer is:

stir

I believe this is a double definition.

'mix in' is the first definition.
(I've seen this in another clue)

'prison' is the second definition.
(informal term for prison)

(Other definitions for stir that I've seen before include "Whisk, agitate" , "Prison (slang) - disturbance" , "Move; wake" , "Ladies' underwear" , "Commotion - prison" .)

I've seen this clue in The Daily Express and The Mirror.
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