City buried by Vesuvius (7)
I believe the answer is:
pompeii
'city buried by vesuvius' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for pompeii that I've seen before include "Ancient city near Naples destroyed by volcano" , "Ancient site" , "Ancient Italian city" , "City destroyed but preserved by Vesuvius" , "Old Italian city" .)