Crossword Genius

Coal or propane

Ross

I believe the answer is:

fuel

I believe this is a double definition.

'coal' is the first definition.
(thesaurus)

'propane' is the second definition.
(thesaurus)

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

I've seen this clue in The Mirror.
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