Commotion; prison (4)

I believe the answer is:

stir

I believe this clue is a double definition.

'commotion' is the first definition.
(stir can mean a commotion)

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

(Other definitions for stir that I've seen before include "Cause trouble" , "Act as an agitator" , "Agitation - prison" , "move very slightly, or agitate" , "Cause to move in slangy prison" .)

I've seen this clue in The Times.

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