Bird of prey hunting dog (7)
I believe the answer is:
harrier
This clue is a double definition.
'bird of prey' is the first definition.
(harrier is a kind of bird of prey)
'hunting dog' is the second definition.
(I know that harrier is a type of hound)
(Other definitions for harrier that I've seen before include "that flies!" , "Hound; bird of prey" , "Bird - dog - plane" , "Short-winged hawk" , "Cross-country runner and a hound once used for hunting hares" .)