Talkative bird (4)
I believe the answer is:
myna
'talkative bird' is the definition.
(bird which can imitate human speech)
This is the entire clue.
(Other definitions for myna that I've seen before include "Speech-mimicking bird" , "Talkative bird" , "Bird that's a good mimic" , "Asiatic bird imitating human speech" , "Asian bird" .)