Asian city overwhelmed by outbreak as overcrowding returns (5)
I believe the answer is:
osaka
'asian' is the definition.
(I've seen this before)
'city overwhelmed by outbreak as overcrowding returns' is the wordplay.
'city' becomes 'kas' (I am not sure about this - if you are sure you should believe this answer much more).
'overwhelmed by' means one lot of letters goes inside another (inserted letters get absorbed or overwhelmed).
'outbreak' suggests taking the first letters (I've seen 'outbreak of' mean this).
'returns' says the letters should be written backwards.
The initial letters of 'as overcrowding' is 'ao'.
'kas' put within 'ao' is 'akaso'.
'akaso' reversed gives 'OSAKA'.
Can you help me to learn more?
(Other definitions for osaka that I've seen before include "Japanese city near Kobe" , "Port city on Honshu, Japan" , "Place" , "Japan's third city" , "Far East city" .)