Crossword Genius

Propellant (4)

Ross

I believe the answer is:

fuel

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

This is the entire clue.

(Other definitions for fuel that I've seen before include "Substance burned to source power" , "Material fed to flames" , "Combustible material" , "Coal or gas?" , "Substance to produce energy" .)

I've seen this clue in the Penny Press.
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