Move around in 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)
'in' acts as a link.
(Other definitions for stir that I've seen before include "Act as an agitator" , "Uproar" , "Begin to move" , "Excite emotionally" , "Wake up - prison" .)