Tendency to be dishonest (4)
I believe the answer is:
bent
I believe this is a double definition.
'tendency' is the first definition.
(bent is a kind of tendency)
'dishonest' is the second definition.
(thesaurus)
'to be' is the link.
(Other definitions for bent that I've seen before include "Morally crooked" , "Crooked - tendency" , "Corrupt; grass stalk" , "Criminal - aptitude" , "Dodgy" .)