Doctor copies friend of bishop (9)
I believe the answer is:
episcopal
'of bishop' is the definition.
(I've seen this before)
'doctor copies friend' is the wordplay.
'doctor' indicates anagramming the letters.
'friend' becomes 'pal' (pal can mean a friend).
'copies' anagrammed gives 'episco'.
'episco'+'pal'='EPISCOPAL'
(Other definitions for episcopal that I've seen before include "Governed by bishops" , "Alice's pop? (anag)" , "run by bishops" , "Pepsi-Cola (anag) - pertaining to a bishop" , "To do with bishops imbibing Pepsi-cola?" .)