Crossword Genius

Element that none used (4)

Ross

I believe the answer is:

neon

'element' is the definition.
(I know that neon is a type of element)

'none used' is the wordplay.
'used' indicates anagramming the letters.
'none' anagrammed gives 'NEON'.

'that' acts as a link.

(Other definitions for neon that I've seen before include "Form of lighting" , "Brightly coloured advertising sign" , "Type of lamp" , "Element that gives a red glow in a vacuum tube" , "Gas used in fluorescent lamps" .)

I've seen this clue in The Mirror.
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