Relating to bishops (9)
I believe the answer is:
episcopal
'relating to bishops' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for episcopal that I've seen before include "Relating to a bishop" , "controlled by bishop" , "To do with bishop - maybe Pepsi-Cola" , "run by bishops" , "Pepsi-Cola for bishops' kind of business" .)