Florence's river (4)

I believe the answer is:

arno

'florence's river' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for arno that I've seen before include "River in Tuscany" , "European river" , "Italian river" , "River flowing through Florence and Pisa" , "Florence's river" .)

I've seen this clue in the King Feature Syndicate and The Sun.

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