Give voice with opera cast in Asian city (9)
I believe the answer is:
singapore
'asian city' is the definition.
(Singapore is a city state)
'give voice with opera cast' is the wordplay.
'give voice' becomes 'sing'.
'with' is a charade indicator (letters next to each other).
'cast' indicates anagramming the letters (letters are dispersed or cast around).
'opera' is an anagram of 'apore'.
'sing'+'apore'='SINGAPORE'
'in' acts as a link.
(Other definitions for singapore that I've seen before include "Commonwealth city state" , "SE Asia island state" , "Small country of southeast Asia" , "part of Asia" , "Asian republic" .)