Related Clues:

• Firm welcomes one with a greeting
• “See ya!”
• “Buh-bye!”
• “So long!”
• "Buh-bye!"
• “Toodles!”
• Greeting government agency circular
• Breezy “bye!”
• Brit's "Ciao!"
• 17 Across alternative
• “Later, gator!”
• One way to say goodbye
• "Ciao, old chap!"
• Fancy "bye-bye"
• Activator, oddly inactive for so long