Avian messages (6)
I believe the answer is:
tweets
'messages' is the definition.
(I've seen this before)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for tweets that I've seen before include "Chirps social media postings" , "online comments" , "Sends social media comments, information, etc" , "Social media messages" , "Posts made on Twitter" .)