Criminal proclivity? (4)
I believe the answer is:
bent
I believe this clue is a double definition.
'criminal' is the first definition.
(I've seen this before)
'proclivity?' is the second definition.
(thesaurus)
(Other definitions for bent that I've seen before include "Dishonest; grass" , "Crooked - inclination" , "Crooked - tendency" , "Distorted" , "Propensity, preference" .)