Sounded unoriginal (6)
I believe the answer is:
echoed
'sounded' is the definition.
(echoing is a kind of sounding)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for echoed that I've seen before include "Reverberated; repeated" , "copied" , "said nothing original" , "Rang" , "Resounded" .)