Be inclined to be a cad (4)
I believe the answer is:
heel
I believe this clue is a double definition.
'be inclined' is the first definition.
(I've seen this before)
'a cad' is the second definition.
(synonyms)
'to be' is the link.
(Other definitions for heel that I've seen before include "Dog training command" , "one regarded with contempt" , "Lean over; part of foot" , "Contemptible person" , "Cad,bounder, blackguard" .)