SEAT trace faulty vehicle (6,3)
I believe the answer is:
estate car
'vehicle' is the definition.
(I know that estate car is a type of motor car)
'seat trace faulty' is the wordplay.
'faulty' is an anagram indicator.
'seat'+'trace'='seattrace'
'seattrace' is an anagram of 'ESTATE-CAR'.
(Other definitions for estate car that I've seen before include "Brake" , "Spacious vehicle" , "Capacious vehicle" , "Vehicle with five doors" , "Motor vehicle" .)