Criminal tendency (4)
I believe the answer is:
bent
This clue is a double definition.
'criminal' is the first definition.
(bent can mean corrupt or criminal)
'tendency' is the second definition.
(bent can mean a propensity or tendency)
(Other definitions for bent that I've seen before include "Crooked - tendency" , "Twisted - corrupt" , "Twisted or determined" , "Natural talent" , "Crooked - inclination" .)