Possible Clues:

• Forest canopy
• Sounds like those over the cops could be putting The Branch in the shade?
• Canopy creators ... or what can literally be found in 6-, 10-, 24- and 34-Down
• Forest skyline
• Nest locales
• In which planes, say, reach maximum height
• Pine pinnacles, e.g.
• Dangers for paragliders
• Mountain view
• This puzzle's theme found in the answers to five asterisked clues