Folk literature about one French river (5)

I believe the answer is:

loire

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'one french river' is the definition.
(River Loire)

'folk literature about' is the wordplay.
'folk literature' becomes 'loi' (I can't explain this - if you can you should give a lot more credence to this answer).
'about' becomes 're' ('re' means regarding or about).
'loi'+'re'='LOIRE'

Can you help me to learn more?

(Other definitions for loire that I've seen before include "Longest French river" , "French river (Orleans, Tours, Nantes)" , "flower abroad" , "valley famous for its wines" , "banker" .)

I've seen this clue in The Irish News.

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