Buried city (7)
I believe the answer is:
pompeii
'buried city' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for pompeii that I've seen before include "Italian city, buried by volcanic ash 79 AD" , "Ancient site" , "Old Italian city" , "Ancient town near Naples buried by volcanic ash" , "Ancient city in Italy" .)