Inclination to leave (4)
I believe the answer is:
will
I believe this clue is a double definition.
'inclination' is the first definition.
(I've seen this before)
'leave' is the second definition.
('will' can be a synonym of 'leave')
'to' is the link.
(Other definitions for will that I've seen before include "- And Grace, TV series" , "Final disposition" , "Resolve - testament" , "mind" , "Intention; bequeath" .)