One bent on villainy (5)

I believe the answer is:
crook
'one bent' is the definition.
(thesaurus)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for crook that I've seen before include "Something kinky" , "Well, no" , "Professional criminal" , "Criminal - taken in hand by bishop" , "Bend; criminal; staff" .)
