Crossword Genius

Races, as an engine (4)

Ross

I believe the answer is:

'races as an engine' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for revs that I've seen before include "Rotations of a motor, in short" , "Units of engine speed (abbr)" .)

I've seen this clue in The New York Times, the Universal and the Newsday.
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