Festival of lights celebrated by Hindus, Jains and Sikhs (6)

I believe the answer is:

diwali

(Other definitions for diwali that I've seen before include "Hindu festival of lights" , "Festival in honour of Lakshmi" , "Light festival" , "Hindu festival; I'd wail (anag.)" , "religious festival" .)

I've seen this clue in The Guardian.

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