Crossword Genius

Crime's a burning question (5)

Ross

I believe the answer is:

arson

I'm a little stuck... Click here to teach me more about this clue!

'crime's' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for arson that I've seen before include "Criminal pyromania" , "A burning crime" , "Roans (anag)" , "Fire-lighting crime" , "Be pettish" .)

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