Related Clues:

• Stumbling block
• Problem
• Link up
• Sudden snag
• Unexpected obstacle
• Military stint
• Link up
• Give a thumbs up?
• Knot that's easily loosened
• Marry, casually
• Trailer's connection to a car
• Pull (up), as pants
• Snag in a plan
• Kind of knot
• How the knot becomes irritating at last