Crossword Genius

Good as neon or helium (3)

Ross

I believe the answer is:

gas

'neon or helium' is the definition.
(I've seen this in another clue)

'good as' is the wordplay.
'good' becomes 'g' (abbreviation).
'g'+'as'='GAS'

(Other definitions for gas that I've seen before include "Empty talk (colloq.)" , "Eg, oxygen" , "Hydrogen or methane, say" , "Form of fossil fuel" , "Neon, for example" .)

I've seen this clue in The Sun.
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