Related Clues:

• Kind of finish
• Campus climber
• See 4-Down
• Sturdy one
• Acorn, eventually
• Shade provider
• Ilex, for one
• Poisonous shrub
• Old college building feature
• Hard wood
• See 14-Across
• Tannin source
• Arbutus, e.g.
• Tree with tiny red berries
• Symbol of strength