They come to light (5)

I believe the answer is:

moths

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'they' is the definition.
Both the answer and definition are plural nouns.
Maybe you can see a link between them that I can't see?

I don't understand how the remainder of the clue works.

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(Other definitions for moths that I've seen before include "Insects related to butterflies" , "They're attracted to light" , "Nocturnal insects that breed in cloth" , "Night-flying insects" .)

I've seen this clue in The Globe and Mail and the Evening Standard.

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