China to rebuild ancient city (7)
I believe the answer is:
antioch
'ancient city' is the definition.
(ancient Greek city)
'china to rebuild' is the wordplay.
'rebuild' indicates anagramming the letters (I've seen 'rebuilt' mean this).
'china'+'to'='chinato'
'chinato' is an anagram of 'ANTIOCH'.
(Other definitions for antioch that I've seen before include "Southern Turkish city" , "early Christian centre" , "Ancient name for Antakya in Turkey" , "Early centre of Christianity" , "Ancient city now Antakya" .)