Crossword Genius

Athlete would be naughtier were I to enter (5)

Ross

I believe the answer is:

racer

'athlete' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

(Other definitions for racer that I've seen before include "One car" , "Bike, perhaps" , "Participant in speed contest" , "American snake" , "fast-moving vehicle" .)

I've seen this clue in The Times.
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