Reverberant (6)
'reverberant' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for echoing that I've seen before include "Repetition" , "Copying" , "Resounding" , "sending back imitations" , "Reverberating" .)
'reverberant' is the definition.
(I've seen this in another clue)
This is all the clue.