Related Clues:

• Output of 31-Down
• It comes back to a spelunker
• Yodeler's reverberation
• Second coming?
• Hint of the past
• Off-the-wall reply
• Sound rebound
• She pined for Narcissus
• Sound return
• Sonar response
• Alpine sound
• 1960 satellite launch
• Returned call?
• Repeat
• Yodeler's elicitation