Crossword Genius

Races, as an engine (4)

Ross

I believe the answer is:

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">races as an engine</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(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 Newsday, The New York Times and the Universal.
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