Vessel covering country port (5)

I believe the answer is:

pusan

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'port' is the definition.
The answer and definition can be both locations as well as being singular nouns.
Maybe there's a link between them I don't understand?

'vessel covering country' is the wordplay.
'vessel' becomes 'pan' (vessel or container for cooking).
'covering' indicates putting letters inside.
'country' becomes 'us' (US is an example).
'pan' placed around 'us' is 'PUSAN'.

Can you help me to learn more?

(Another definition for pusan that I've seen is " Largest port in South Korea".)

I've seen this clue in the Sydney Morning Herald.

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