Related Clues:

• Theme of this puzzle
• Ties up
• Classifies
• Difficult problems
• See 32-Across
• Entanglements
• Ship speed units
• Harvest-time collection
• Tangles
• Some are square
• Nautical measures
• Stomachs may be in them
• Certain speed units
• Shoelace problems
• Bowline and sheepshank