Related Clues:

• Bill owner
• Hawk or auk
• Plane
• Boston Celtics legend
• Charlie Parker's nickname
• Former N.B.A. star with a hint to 17-, 23-, 52- and 60-Across
• Nest dweller
• Ptarmigan, for one
• Robin, e.g.
• Celtic hero
• Robin or wren
• Boston Celtics legend, Larry
• Grouse or snipe
• Word with 15-Down
• Robin or swallow