Good as can be for cooking (3)

I believe the answer is:

gas

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'can be for cooking' is the definition.
I can't judge whether this defines the answer.

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

Can you help me to learn more?

(Other definitions for gas that I've seen before include "Something exciting" , "Petrol (US)" , "Americans' petrol" , "It's not liquid or solid, like American petrol" , "16 (US)" .)

I've seen this clue in the Evening Standard.

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