A carriage originally seen in ancient French city (6)
I believe the answer is:
amiens
'french city' is the definition.
(I've seen this in another clue)
'a carriage originally seen' is the wordplay.
'carriage' becomes 'mien' (I've seen this in another clue).
'originally' indicates taking the first letters.
The first letter of 'seen' is 's'.
'a'+'mien'+'s'='AMIENS'
'in ancient' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for amiens that I've seen before include "French cathedral city on the river Somme" , "French town" , "capital of Picardy" , "City of NE France" , "European town" .)