Gold seen on state carriage (6)
I believe the answer is:
landau
'carriage' is the definition.
(I've seen this before)
'gold seen on state' is the wordplay.
'gold' becomes 'au' (Au is the chemical symbol for gold**).
'seen on' says to put letters next to each other.
'state' becomes 'land' ('land' can be a synonym of 'state').
'au' put after 'land' is 'LANDAU'.
(Other definitions for landau that I've seen before include "An auld type of carriage" , "Old-fashioned four-wheeled covered carriage" , "Horse-drawn, folded-top carriage" , "Transport" , "Four-wheeled vehicle with two folding hoods" .)