Related Clues:

• Cause a clog
• What paper towels do to a toilet
• Copier malfunction
• Traffic trouble
• Pipe blocker
• Drain pain
• Get blocked up
• Folk dancer's shoe, perhaps
• Dutch shoe
• Footwear that's hard to run in
• Copy room malfunction
• Block the pipes
• Become blocked
• Cousin of a 55-Down
• Reason to call Roto-Rooter