Move around prison (4)

I believe the answer is:

stir

I believe this clue is a double definition.

'move around' is the first definition.
(synonyms)

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

(Other definitions for stir that I've seen before include "Stimulate; prison" , "beat" , "Arouse; commotion" , "Prison - mix" , "Mix the ingredients" .)

I've seen this clue in The Telegraph.

Want a hint initially instead of a full solution? Install my app