Where bishop is to supervise? (7)
I believe the answer is:
oversee
'is to supervise' is the definition.
(I've seen this in another clue)
I don't understand the remainder of the clue.
(Other definitions for oversee that I've seen before include "Supervise, control" , "Exercise supervision" , "Act as tutor" , "Supervise like ganger" , "take charge" .)