Crossword Genius

Part of Oslo, also known as a Japanese port (5)

Ross

I believe the answer is:

osaka

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'a japanese port' is the definition.
(I've seen this before)

'part of oslo also known as' is the wordplay.
'part of oslo' becomes 'os' (I can't explain this - if you can you should give a lot more credence to this answer).
'also known as' becomes 'aka' (synonyms).
'os'+'aka'='OSAKA'

Can you help me to learn more?

(Other definitions for osaka that I've seen before include "Japan's third-largest city" , "Japan's third city" , "Asian" , "Japanese port, Bay" , "Third largest city in Japan" .)

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