Related Clues:

• Advertising circular, e.g.
• River vessel
• Ad section
• Shim, e.g.
• Sunday paper extra
• Payphone word
• Tab, at times
• Sunday-paper ad, often
• Nile transport
• Mississippi River transport
• One might precede a tug
• Add with a caret, e.g.
• Ad that falls out of a newspaper
• Flat-bottom boat
• Tower of trash