Crossword Genius

Nonsense! Light up! (4)

Ross

I believe the answer is:

rats

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I'm afraid I can't even guess how this answer relates to the clue.

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(Other definitions for rats that I've seen before include "Treacherous rodents" , "Blast" , "Rodent pests" , "Damn" , "(Hunts) rodents - expression of irritation" .)

I've seen this clue in the Evening Standard.
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