Weekend with one old girl, touring a NSW coastal town (5)

I believe the answer is:

kiama

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'touring a nsw coastal town' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'weekend with one old girl' is the wordplay.
'weekend' becomes 'k' (I've seen this in other clues).
'with' is a charade indicator (letters next to each other).
'one' becomes 'i' (Roman numeral).
'old girl' becomes 'ama' (I can't explain this - if you can you should believe this answer much more).
'k'+'i'+'ama'='KIAMA'

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

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