Carriage lined at the front with gold (6)
I believe the answer is:
landau
'carriage' is the definition.
(landau is a kind of carriage)
'lined at the front with gold' is the wordplay.
'at the front' suggests taking the first letters.
'with' becomes 'and'.
'gold' becomes 'au' (Au is the chemical symbol for gold).
The initial letter of 'lined' is 'l'.
'l'+'and'+'au'='LANDAU'
(Other definitions for landau that I've seen before include "Four-wheeled horse-drawn carriage" , "Four-wheeled vehicle with two folding hoods" , "Old-fashioned four-wheeled covered carriage" , "Horse-drawn, folded-top carriage" , "A four-wheel covered carriage" .)