A hole added to belt out in Asian country (9)
I believe the answer is:
singapore
'asian country' is the definition.
(country in Asia)
'a hole added to belt out' is the wordplay.
'hole' becomes 'pore' (pore is a kind of hole).
'added to' means one lot of letters go next to another.
'belt out' becomes 'sing' (belt out can informally mean to sing).
'a'+'pore'='apore'
'apore' put after 'sing' is 'SINGAPORE'.
'in' acts as a link.
(Other definitions for singapore that I've seen before include "Island nation once a British crown colony" , "Far-Eastern state" , "Asian country, capital and mega-port" , "Small country of southeast Asia" , "Foreign capital" .)