Crossword Genius

I can dispense with the candle: it's useless (4)

Ross

I believe the answer is:

idle

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

I can't explain the rest of the clue.

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(Other definitions for idle that I've seen before include "Frivolous" , "Monty Python team member" , "lndolent" , "out of a job" , "Explosive stuff" .)

I've seen this clue in the Evening Standard.
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