Four-door car (5)
I believe the answer is:
sedan
'four-door car' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for sedan that I've seen before include "Dean's in an old conveyance" , "Enclosed chair" , "Old carrier chair for Danes" , "Andes (anag.)" , "Saloon car (US)" .)