Related Clues:

• Hierarchical chart
• Squirrels' hangout
• Swing support, perhaps
• Cruise about town
• It's stuffed with wood
• Awl, e.g.
• Drill, e.g.
• Wrench or pliers
• Cherry or chestnut
• Family diagram
• Shoe stretcher
• Cheshire cat's hangout
• Bird house?
• Useful thing
• Arboretum specimen