Crossword Genius

Form of fuel (4)

Ross

I believe the answer is:

coke

'form of fuel' is the definition.
(I know that coke is a type of fuel)

This is all the clue.

(Other definitions for coke that I've seen before include "Solid fuel - drink - drug" , "Residue from coal used as fuel" , "Substance left after gas and tar have been extracted from coal" , "Fuel derived from coal" , "'Soft drink and hard drug, in short (4)'" .)

I've seen this clue in The Sun and The Telegraph.
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