Bit of excitement in prison (4)
I believe the answer is:
stir
This might be a double definition.
'bit of excitement' is the first definition.
'stir' can be an answer for 'excitement' (synonyms). I am unsure of the 'bit of' bit.
'prison' is the second definition.
(informal term for prison)
'in' acts as a link.
Can you help me to learn more?
(Other definitions for stir that I've seen before include "Excite emotionally" , "cooler" , "What keeps those inside" , "Agitate - disturbance" , "Cause to move in slangy prison" .)