Engine driver? (6)

I think it could be either:

Which length description are you looking for?:

petrol

'engine driver?' is the definition.
(the fuel that drives the engine)

This is all the clue.

(Other definitions for petrol that I've seen before include "Mineral oil refined as fuel" , "Liquid fuel" , "Common motor fuel" , "Gasoline" , "Fuel for road vehicles" .)

I've seen this clue in The Sun.

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