Car competitor (5)
I believe the answer is:
racer
(Other definitions for racer that I've seen before include "Perhaps 16 [SCRAMBLER]" , "fast-moving vehicle" , "someone driving very fast?" , "Fast mover" , "Runner" .)
I believe the answer is:
racer
(Other definitions for racer that I've seen before include "Perhaps 16 [SCRAMBLER]" , "fast-moving vehicle" , "someone driving very fast?" , "Fast mover" , "Runner" .)