Transport back from the races (3)
I believe the answer is:
car
'transport' is the definition.
(car is a kind of transport)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for car that I've seen before include "Road vehicle; rail coach" , "Private transport" , "One for the road?" , "Wheels" , "4-wheeled vehicle" .)