Related Clues:

• Difficulty
• Form
• Unit of speed
• Math figure
• Hitch, e.g.
• Boy Scout's creation
• Tie tightly
• Nautical unit
• Muscle problem
• It's tied at the altar
• Bowline, for one
• Gordian or slip follower
• Eskimo people
• Physique
• Two-by-four flaw