Shawshank Redemption villain (6)
I believe the answer is:
warden
'shawshank redemption villain' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for warden that I've seen before include "Head of certain schools, colleges, etc" , "Official in charge of prisoners" , "The - (Trollope)" , "Guard, keeper" , "Warned about supervisory official" .)