Crossword Genius

Source of energy (4)

Ross

I believe the answer is:

fuel

'source of energy' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for fuel that I've seen before include "Burned source of energy" , "Gas, oil or petrol, for instance" , "Eg, coal or oil" , "coal etc" , "Coal or gas?" .)

I've seen this clue in The Mirror and The Times.
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