Horse-drawn cab (6)
I believe the answer is:
hansom
'horse-drawn cab' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for hansom that I've seen before include "Victorian cab" , "Type of cab" , "transport from the old days" , "Two-wheeled one-horse carriage" , "One-horse cab" .)