Related Clues:

• Sonar comeback
• Off-the-wall comeback?
• Marketing device
• Promotional campaign adjunct
• Marketing ploy
• Recording studio effect
• Output of 31-Down
• It comes back to a spelunker
• Yodeler's reverberation
• Second coming?
• Off-the-wall reply
• Sound rebound
• Promotional ploy
• She pined for Narcissus
• Sound return