Open carriage (6)
I believe the answer is:
landau
'open carriage' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for landau that I've seen before include "Transport" , "Horse-drawn carriage or car with folding top" , "An auld type of carriage" , "Old four-wheeled covered carriage" , "Four-wheeled horse-drawn carriage" .)