Correct in a WA or southern Japanese region (7)
I believe the answer is:
okinawa
'southern japanese region' is the definition.
The definition and answer can be both locations as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'correct in a wa' is the wordplay.
'correct' becomes 'ok'.
'ok'+'in'+'a'+'wa'='OKINAWA'
'or' acts as a link.
Can you help me to learn more?
(Other definitions for okinawa that I've seen before include "island out east" , "Campaign in the closing days of World War II in the Pacific" , "Group of small islands in southern Japan with US military presence" , "Pacific island" , "Japanese city" .)