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For river basins, Virginia goes to the French south (5)

Ross

I believe the answer is:

vales

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'for river basins' is the definition.
I can't judge whether this definition defines the answer.

'virginia goes to the french south' is the wordplay.
'virginia' becomes 'va' (US state abbreviation).
'goes to' means one lot of letters go next to another.
'the french' becomes 'le' ('the' in French).
'south' becomes 's' (abbreviation).
'va'+'le'+'s'='VALES'

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I've seen this clue in The Irish News.
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