Crossword Genius

French department derived from Siena! (5)

Ross

I believe the answer is:

aisne

'french department' is the definition.
(I've seen this in another clue)

'derived from siena' is the wordplay.
'derived from' indicates an anagram.
'siena' anagrammed gives 'AISNE'.

I've seen this clue in The Irish Independent.
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