Disposed to oppose and contradict (8)
I believe the answer is:
perverse
'disposed to oppose and contradict' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for perverse that I've seen before include "Cross-grained" , "Preserve in order to be stubbornly intractable" , "It's wrong" , "Deviant" , "Irregular" .)