Echo again to the noise of (7)
I believe the answer is:
'echo' is the definition.
(I've seen this before)
'again to the noise of' is the wordplay.
I cannot really see how this works, but
'again' could be 're' (prefix meaning 'again') and 're' is located in the answer.
'noise' could be 'sound' (I've seen this before) and 'sound' is found in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for resound that I've seen before include "Reverberate" , "ring" , "Echo" .)