He mentions Australian port (6)

I believe the answer is:

sidney

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'port' is the definition.
Both the answer and definition are singular nouns.
Perhaps you can see a link between them that I don't see?

'he mentions australian' is the wordplay.
'he' becomes 'Sid'.
'mentions australian' becomes 'ney' (I am not sure about this - if you are sure you should believe this answer much more).
'sid'+'ney'='SIDNEY'

Can you help me to learn more?

(Other definitions for sidney that I've seen before include "Disney over in Australia" , "Sir Philip --, English poet" , "Disney in Oz?" .)

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