Of feathered friends (5)
I believe the answer is:
avian
'of feathered friends' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for avian that I've seen before include "Resembling a bird" , "To do with birds - like a dangerous flu" , "Birdlike" , "Like a booby" , "Regarding birds" .)