Crossword Genius

Agitate in prison (4)

Ross

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.

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(Other definitions for stir that I've seen before include "Move around in a liquid" , "Commotion; wake" , "can > go forth" , "Prison (slang) - disturbance" , "Agitate; wake from sleep" .)

I've seen this clue in The Sun and the Sydney Morning Herald.
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