French currency Eire's adapted (5)

I believe the answer is:

isere

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'french currency' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'eire's adapted' is the wordplay.
'adapted' indicates an anagram.
'eires' anagrammed gives 'ISERE'.

Can you help me to learn more?

(Other definitions for isere that I've seen before include "River of south-eastern France" , "somewhere in France" , "French runner" , "French department" , "French division" .)

I've seen this clue in The Globe and Mail.

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