Possible Clues:

• Gee! On the street in Dublin? No, on the canal
• Traditional boatman of Venice
• Boatman, one doomed to ship broken idol
• Roughly ignore old punter
• Boatman doing role play
• Propeller of boat, liner good at sea
• No-hoper holds false idol to be one who rows
• Polish chap found in Venice?
• Punter, old knackered one, invested in knackered horse, perhaps?
• One of a titled brotherhood, claimant to throne in the house of Savoy?