Related Clues:

• Below the intended pitch
• Outright
• Prostrate
• Like the plains
• London apartment
• Pump kin
• Concertgoer
• Fizzless, as a Coke
• One way to be turned down
• Needing tuning, maybe
• Needing a 1-Across
• One present
• In need of tuning
• Needing to get keyed up?
• In need of air, possibly