Crossword Genius

A motor fuel (6)

Ross

I believe the answer is:

diesel

'a motor fuel' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for diesel that I've seen before include "Motor fuel" , "Common fuel for heavy vehicles" , "Eponymous German engineer" , "Liquid fuel" , "See lid for the engine" .)

I've seen this clue in the Irish Times (Simplex) and The Irish Times.
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