Light horse-drawn carriage (8)
I believe the answer is:
stanhope
'light horse-drawn carriage' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for stanhope that I've seen before include "It may have only two wheels" , "carriage that has seat only for one" , "Light horse-drawn carriage; Nineteen across (anag.)" , "vehicle" , "Phaetons can be turned into a light open one-seater carriage" .)