Agitated in prison, revolutionary (7)
I believe the answer is:
stirred
'agitated' is the definition.
(stirring is a kind of agitating)
'prison revolutionary' is the wordplay.
'prison' becomes 'stir' (informal term for prison).
'revolutionary' becomes 'red'.
'stir'+'red'='STIRRED'
'in' is the link.
(Other definitions for stirred that I've seen before include "Excited" , "Emotionally stimulated" , "Agitated with a circular motion" , "like Earl Grey sometimes?" , "Roused; mixed (a liquid)" .)