Crossword Genius

It's good as hot air (3)


I believe the answer is:


'hot air' is the definition.
(I've seen this in another clue)

'it's good as' is the wordplay.
'it's good' becomes 'g' (abbreviation).

(Other definitions for gas that I've seen before include "It's not liquid or solid, like American petrol" , "Chatter (colloq.)" , "Hydrogen, for example" , "Petrol (US)" , "idle chit-chat" .)

I've seen this clue in the Evening Standard.
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