Crossword Genius

Derby entrant (5)

Ross

I think it could be either:

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4

5

racer

(Other definitions for racer that I've seen before include "American snake" , "Greyhound" , "Perhaps 16 [SCRAMBLER]" , "Runner" , "someone driving very fast?" .)

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