From the echo I recognised a vocal group (5)
I believe the answer is:
choir
'vocal group' is the definition.
(group of vocalists)
'from the echo i recognised a' is the wordplay.
'from' says the answer is hidden in the clue.
'CHOIR' is hidden within 'echo i recognised a'.
(Other definitions for choir that I've seen before include "People in church" , "warblers" , "set of singers" , "Large group of singers" , "Vocalists in group" .)