Sound that rebounds (4)
I believe the answer is:
echo
'sound that rebounds' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for echo that I've seen before include "Nymph (only able to repeat the last words of others)" , "Be suggestive of" , "E; reverberation" , "Marked by heat" , "Sound returning some moments later" .)