Related Clues:

• Reflected radio wave
• Gym effect
• Sound comeback
• Repeat exactly
• Agree with, as sentiments
• Repercussion
• Response to a cave shout
• Uninformative answer?
• Alpine response
• Something repetitive
• Reflection of a kind
• Kind of cardiogram
• Bounce off the walls
• Reminiscent trace
• Radar blip