Petrol

I think it could be either:

Which length description are you looking for?:

gas

'petrol' is the definition.
(synonyms)

This is the entire clue.

(Other definitions for gas that I've seen before include "Oxygen maybe" , "Something exciting" , "Talk idly; fuel" , "Talk profusely" , "Eg, nitrogen" .)

I've seen this clue in The Mirror.

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