Chauffeur-driven vehicle (4)
I believe the answer is:
limo
'chauffeur-driven vehicle' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for limo that I've seen before include "Stretched car (abbr)" , "Stretched car, often used for partying" , "Set of rooms" , "vehicle" , "Large luxurious car" .)