Italian river that rises in the Apennines and flows through Florence to the Ligurian Sea (4)

I believe the answer is:

arno

(Other definitions for arno that I've seen before include "River in central Italy" , "River of 11 across" , "Pisa's river" , "River flowing through Florence and Pisa" , "Florence's river" .)

I've seen this clue in The Independent.

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