Pepsi Cola, refreshment of bishops (9)
I believe the answer is:
episcopal
'of bishops' is the definition.
(I've seen this before)
'pepsi cola refreshment' is the wordplay.
'refreshment' indicates anagramming the letters.
'pepsi'+'cola'='pepsicola'
'pepsicola' anagrammed gives 'EPISCOPAL'.
(Other definitions for episcopal that I've seen before include "Pepsi-Cola (anag) - pertaining to a bishop" , "work of bencher" , "controlled by bishop" , "Relating to bishops" , "Pepsi-Cola for bishops' kind of business" .)