Crossword Genius

In France, water blended with oil with some care (5)

Ross

I believe the answer is:

loire

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

'in france' is the definition.
('Loire' is part of 'france')

'water blended with oil with some care' is the wordplay.
I cannot really understand how this works, but
an anagram of 'oil' is 'loi' which is located in the answer.
The remaining letters 're' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for loire that I've seen before include "River of central France" , "flower found amid vineyards" , "French runner" , "French river (Orleans, Tours, Nantes)" , "River flowing through Tours and Nantes" .)

I've seen this clue in the Evening Standard.
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