Bad lighting? (5)

I believe the answer is:

arson

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'bad lighting' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe they are linked in a way I don't understand?

This is all the clue.

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(Other definitions for arson that I've seen before include "Fire-raising crime" , "Criminal activity" , "Malicious burning to destroy property" , "Crime involving fire" , "Act of a pyromaniac" .)

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

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