City newly built, as last of seven (8)
I believe the answer is:
istanbul
'city' is the definition.
(Istanbul is an example)
'newly built as last of seven' is the wordplay.
'newly' indicates anagramming the letters.
'last of' suggests the final letters.
The final letter of 'seven' is 'n'.
'built'+'as'+'n'='builtasn'
'builtasn' is an anagram of 'ISTANBUL'.
(Other definitions for istanbul that I've seen before include "foreign city" , "European city" , "Turkey's largest city" , "City - lab units (anag)" , "Nail bust in the Turkish city" .)