Crossword Genius

Maybe it's covered in spilt fuel, thus useless (6)

Ross

I believe the answer is:

futile

(Other definitions for futile that I've seen before include "Ineffective" , "Useless, a waste of effort" , "In vain, a waste of time" , "Effectless" , "Useless or vain" .)

I've seen this clue in the Evening Standard.
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