Bring down gold carriage (6)
I believe the answer is:
landau
'carriage' is the definition.
(I've seen this before)
'bring down gold' is the wordplay.
'bring down' becomes 'land' ('land' can be a synonym of 'bring down').
'gold' becomes 'au' (Au is the chemical symbol for gold**).
'land'+'au'='LANDAU'
(Other definitions for landau that I've seen before include "A four-wheel covered carriage" , "Horse-drawn carriage or car with folding top" , "Transport" , "Old-fashioned four-wheeled covered carriage" , "Four-wheeled horse-drawn carriage" .)