A priest organising social occasions (7)
I believe the answer is:
parties
'social occasions' is the definition.
(party is a kind of social occasion)
'a priest organising' is the wordplay.
'organising' is an anagram indicator.
'a'+'priest'='apriest'
'apriest' anagrammed gives 'PARTIES'.
(Other definitions for parties that I've seen before include "Celebrates" , "Fun affairs for political groups" , "They may be thrown" , "Celebrations" , "Social gatherings" .)