Grill fuel (7)

I think it could be either:

Which length description are you looking for?:

gas

'grill fuel' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for gas that I've seen before include "Hydrogen or methane, say" , "Piped fuel" , "Nitrogen maybe" , "Substance like air" , "American fuel" .)

I've seen this clue in the Newsday.

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