Crossword Genius

None used gas (4)

Ross

I believe the answer is:

neon

'gas' is the definition.
(neon is a gas)

'none used' is the wordplay.
'used' is an anagram indicator.
'none' with letters rearranged gives 'NEON'.

(Other definitions for neon that I've seen before include "Gas used in fluorescent lighting" , "Gas used in fluorescent lamps" , "Inert gas, symbol Ne" , "Gaseous element, in advertising signs, say" , "Could it brighten proceedings" .)

I've seen this clue in The Mirror.
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