A monarch in state you reportedly banished? Just the opposite (8)
I believe the answer is:
contrary
'the opposite' is the definition.
(synonyms)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for contrary that I've seen before include "Exact opposition" , "Opposed or perverse" , "Opposite, perverse" , "Quite like Mary" , "Carry out (command)" .)