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" .)