Diwali celebrant (5)
I believe the answer is:
hindu
'diwali celebrant' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for hindu that I've seen before include "Member of religious group" , "Member of great Indian religion with belief in reincarnation" , "Person with faith" , "Believer in South Asian religion" , "Brahma is one of his gods" .)