Asian city: it's in pretty good area (5)
I believe the answer is:
osaka
'asian city' is the definition.
'Osaka' can be an answer for 'city' (Japanese city). I'm unsure of the 'asian' bit.
'it's in pretty good area' is the wordplay.
'it' becomes 'sa' (old-fashioned abbreviation for sex appeal).
'in' indicates putting letters inside.
'pretty good' becomes 'ok' (I am not sure about the 'pretty' bit.).
'area' becomes 'a' (maths abbreviation).
'sa' placed within 'ok' is 'osak'.
'osak'+'a'='OSAKA'
Can you help me to learn more?
(Other definitions for osaka that I've seen before include "Japanese port city" , "Japanese city near Kobe" , "S. Japan port, bay" , "Large city and port in Japan" , "Japanese port, on Honshu" .)