Possible Clues:

• Peter ___, cartoonist
• Sight from the top of the Leaning Tower
• River coming from the tarn overflowed
• Pisa's waterway
• What the Ponte Vecchio spans
• River seen from the entrance of the Uffizi Gallery
• It's under the Ponte Vespucci
• River of central Italy rising in the Apennines
• River near the Leaning Tower of Pisa
• The river Lucy Honeychurch wanted to see from her room at the Pension Bertolini