Characters in carriage driven over the hill? (4)
I believe the answer is:
aged
'over the hill?' is the definition.
(I've seen this before)
'characters in carriage driven' is the wordplay.
'characters in' indicates a hidden word.
'AGED' can be found hidden inside 'carriage driven'.
(Other definitions for aged that I've seen before include "Antiquated" , "Old or ancient" , "not like a callow youth" , "well over the hill" , "Mature" .)