Hindu festival of lights (6)
I believe the answer is:
diwali
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hindu festival of lights</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for diwali that I've seen before include "religious festival" , "Hindu festival; I'd wail (anag.)" , "Light festival" , "Indian festival" , "Hindu festival of lights" .)