Crossword Genius

Mini four-wheeled racer (2-4)

Ross

I believe the answer is:

go-kart

(Other definitions for go-kart that I've seen before include "Miniature racing car with skeleton body" , "Small, low racer" , "Small racing vehicle (K, not C)" , "Lightweight racer" , "Small racing car" .)

I've seen this clue in The Guardian.
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