"Stretch" vehicle (4)
I believe the answer is:
limo
'stretch 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, often used for partying" , "vehicle" , "Luxurious car (colloq.)" , "Long motor" , "Set of rooms" .)