Extort warder (5)
I believe the answer is:
screw
I believe this is a double definition.
'extort' is the first definition.
(thesaurus)
'warder' is the second definition.
(thesaurus)
(Other definitions for screw that I've seen before include "Hack" , "Cheat" , "The Turn of the ___ , 1898 Henry James horror story" , "Prison officer (slang)" , "shot in pool hall" .)