Possible Clues:

• Tweet to thwart censure at last
• Tube for conveying gas or liquid
• Tweet from churchwarden?
• Snowman's smoke
• St. Nick accessory
• Word that can follow the end of 18-, 27-, 46- or 61-Across
• Good exercise channel
• Apply with a tube, as frosting
• Sherlock’s calabash, for one
• Plumber's duct