Inclination to be corrupt (4)
I believe the answer is:
bent
I believe this is a double definition.
'inclination' is the first definition.
(bent is a kind of inclination)
'be corrupt' is the second definition.
(I've seen this before)
'to' is the link.
(Other definitions for bent that I've seen before include "Crooked - penchant" , "Crooked - inclination" , "Natural aptitude" , "Angled; corrupt" , "Dishonest - inclination" .)