Beauty’s first seen in a sublime ruined temple site (3,6)
I believe the answer is:
abu simbel
'temple site' is the definition.
(I've seen this before)
'beauty's first seen in a sublime ruined' is the wordplay.
'first seen in' indicates taking the first letters.
'ruined' indicates an anagram.
The initial letter of 'beautys' is 'b'.
'b'+'a'+'sublime'='basublime'
'basublime' with letters rearranged gives 'ABU SIMBEL'.
(Other definitions for abu simbel that I've seen before include "temple site" , "Egyptian temple complex moved when Aswan dam was created" , "Site of two rock temples in southern Egypt" .)