Legal documents about axing women's prison (4)

I believe the answer is:

stir

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

I don't understand the remainder of the clue.

(Other definitions for stir that I've seen before include "Whisk, blend" , "beat" , "cooler" , "Move around in a liquid" , "Cause to move in slangy prison" .)

I've seen this clue in The Independent.

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