Magistrate perversely rejecting current plan (9)
I believe the answer is:
stratagem
'plan' is the definition.
(stratagem is a kind of plan)
I cannot understand how the remainder of the clue works.
(Other definitions for stratagem that I've seen before include "way to outwit opponent" , "Start game with cunning plan" , "Scheme to outwit an opponent" , "Cunning manoeuvre" , "Cunning plot" .)