Gas or coal (4)

I believe the answer is:

fuel

I believe this is a double definition.

'gas' is the first definition.
(I've seen this in another clue)

'coal' is the second definition.
(thesaurus)

(Other definitions for fuel that I've seen before include "Material for burning" , "Eg, coal or oil" , "Combustible material" , "Burned source of energy" , "Combustibles" .)

I've seen this clue in The New York Times.

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