Crossword Genius

Keeps the engine running, without moving (5)

Ross

I believe the answer is:

idles

(Other definitions for idles that I've seen before include "Avoids working" , "Spends time doing nothing" , "Wastes time" , "Of engine, just ticks over in neutral" , "Does little, just ticks over" .)

I've seen this clue in The New York Times.
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