Mentioned tyre found at rear of vehicle (7)
I believe the answer is:
exhaust
'vehicle' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe there's a link between them I don't understand?
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for exhaust that I've seen before include "Pipe that carries engine fumes away" , "Pipe to take away car fumes" , "Tube carrying off fumes from car engine" , "Devitalize, drain of energy" , "Drain completely" .)