Magician’s bird of prey (6)
I believe the answer is:
merlin
This clue is a double definition.
'magician's' is the first definition.
(I've seen this before)
'bird of prey' is the second definition.
(merlin is a kind of bird of prey)
(Other definitions for merlin that I've seen before include "Flighty type" , "could be relied on for a spell?" , "small aggressive bird of prey" , "Arthurian wizard" , "Magician of the Round Table" .)