...do disturb a prison! (4)
I believe the answer is:
stir
I believe this is a double definition.
'do disturb' is the first definition.
(stirring is a kind of disturbing)
'a prison' is the second definition.
(informal term for prison)
(Other definitions for stir that I've seen before include "Whisk or make a move" , "Prison (slang) - disturbance" , "song and dance" , "beat" , "jug" .)