Arrive by gold carriage (6)
I believe the answer is:
landau
'carriage' is the definition.
(I've seen this before)
'arrive by gold' is the wordplay.
'arrive' becomes 'land' (landing is a kind of arriving).
'by' says to put letters next to each other.
'gold' becomes 'au' (Au is the chemical symbol for gold**).
'land'+'au'='LANDAU'
(Other definitions for landau that I've seen before include "Horse-drawn, folded-top carriage" , "Old-fashioned four-wheeled covered carriage" , "Old four-wheeled covered carriage" , "Transport" , "A four-wheel covered carriage" .)