Possible Clues:

• What a plumber might fix a leak in
• Exhaust conduit, e.g
• Water tube
• Frosty has a corncob one
• Tubing that is partly interfering with pianos?
• Word after 'half' or 'exhaust'
• Whistle produced by one with great expectations and energy
• Subject of a Magritte work (or not?)
• Frosty the Snowman has one
• Fife to get the better of Dundee at the end