Related Clues:

• See 20-Across
• Chirrup
• Clique
• Chirp rapidly
• A series of chirps
• Posse
• Chirp
• Clique, e.g.
• Bird sanctuary excitement
• Palpitate
• One's close acquaintances
• Close social group
• Cheep
• Site with the tagline 'What are you doing?'
• Group of people you can trust