Bird trio breeds with barn shaking (5,9)
I believe the answer is:
robin redbreast
'bird' is the definition.
(robin redbreast is a kind of bird)
'trio breeds with barn shaking' is the wordplay.
'with' is a charade indicator (letters next to each other).
'shaking' indicates an anagram.
'trio'+'breeds'+'barn'='triobreedsbarn'
'triobreedsbarn' anagrammed gives 'ROBIN REDBREAST'.
(Other definitions for robin redbreast that I've seen before include "Songbird" , "bird" .)