Doctor copies friend of bishops (9)
I believe the answer is:
episcopal
'of bishops' is the definition.
(I've seen this before)
'doctor copies friend' is the wordplay.
'doctor' indicates an anagram.
'friend' becomes 'pal' (pal is a kind of friend).
'copies' is an anagram of 'episco'.
'episco'+'pal'='EPISCOPAL'
(Other definitions for episcopal that I've seen before include "Alice's pop? (anag)" , "Relating to bishops" , "controlled by bishop" , "Pepsi-Cola (anag) - pertaining to a bishop" , "work of bencher" .)