Retiring English bishop going inside for a drink (6)
I believe the answer is:
sherry
'a drink' is the definition.
(sherry is a kind of drink)
'retiring english bishop going inside' is the wordplay.
'retiring' becomes 'shy' (I've seen this in other clues).
'english' becomes 'e' (abbreviation).
'bishop' becomes 'rr' (abbreviation for Right Reverend).
'going inside' indicates putting letters inside.
'e'+'rr'='err'
'shy' placed around 'err' is 'SHERRY'.
'for' is the link.
(Other definitions for sherry that I've seen before include "Preprandial drink" , "Fortified wine from Jerez" , "Pre-dinner aperitif as from Jerez" , "Fortified 1 down [WINE]" , "Wine from Spain's Jerez region, drunk as an aperitif" .)