Gathered a vocal flock (5)
I believe the answer is:
heard
'gathered' is the definition.
(I've seen this before)
'a vocal flock' is the wordplay.
'a vocal' shows a homophone (sound like).
'flock' becomes 'herd' (I've seen this before).
'herd' is a homophone of 'HEARD'.
(Other definitions for heard that I've seen before include "Picked up by the ears?" , "Caught - picked up" , "Got to know (of)" , "Perceived by the ear" , "Received aurally" .)