Vaulted passage or entrance (7)
I believe the answer is:
archway
This clue is a double definition.
'vaulted passage' is the first definition.
(I've seen this before)
'entrance' is the second definition.
(archway is a kind of entrance)
(Other definitions for archway that I've seen before include "Vaulted entrance; London tube station" , "entrance, perhaps" , "part of London" , "Vaulted passage" , "Entrance structure" .)