Avian canine (7)
I believe the answer is:
harrier
'canine' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for harrier that I've seen before include "jump jet" , "Bird - dog - plane" , "Hound; bird of prey" , "Hare hound" , "Short-winged hawk" .)