Related Clues:

• Buzzer?
• Birds do it
• With 20-Down, airshow activities
• Something in the ointment?
• House buzzer
• Something that shouldn't be left open
• '-- out!' ('Quit that!')
• Do the American thing?
• Perform acceptably
• Perform OK
• Horse ____
• Trout lure
• Go by space shuttle
• Take the plane
• Pitcher plant victim