I attack a poor Asian city (9)
I believe the answer is:
islamabad
'asian city' is the definition.
(capital of Pakistan)
'i attack a poor' is the wordplay.
'attack' becomes 'slam'.
'poor' becomes 'bad' (similar in meaning).
'i'+'slam'+'a'+'bad'='ISLAMABAD'
(Other definitions for islamabad that I've seen before include "Asian city" , "capital city" , "city of Pakistan?" , "Capital of Pakistan" , "Pakistan's capital" .)