Irish love parish priest having a drink (6)
I believe the answer is:
grappa
'drink' is the definition.
(type of alcoholic drink)
'irish love parish priest having a' is the wordplay.
'irish love' becomes 'gra' (I've seen this in another clue).
'parish priest' becomes 'pp' (abbreviation for parish priest).
'having' says to put letters next to each other.
'gra'+'pp'+'a'='GRAPPA'
(Other definitions for grappa that I've seen before include "Italian spirit made from grape residue after pressing" , "Brandy from fermented pressed grape residue" , "Italian drink" , "Italian firewater" , "Italian brandy distilled from grape lees" .)