Crossword Genius

A Pacific capital, one close to central part of Oceania? (4)

Ross

I believe the answer is:

apia

I'm a little stuck... Click here to teach me more about this clue!

'a pacific capital' is the definition.
(I've seen this in another clue)

'one close to central part of oceania?' is the wordplay.
'one' becomes 'a' (a thing is one thing).
'close to' means one lot of letters go next to another.
'central part of oceania?' becomes 'pia' (I can't explain this - if you can you should give a lot more credence to this answer).
'a'+'pia'='APIA'

Can you help me to learn more?

(Other definitions for apia that I've seen before include "Capital of Samoa" , "Samoan port" , "Pacific capital" .)

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