Flier for magician (6)
I believe the answer is:
merlin
I believe this clue is a double definition.
'flier' is the first definition.
(merlin is a kind of birdanimal)
'magician' is the second definition.
(thesaurus)
'for' is the link.
(Other definitions for merlin that I've seen before include "Raptor - wizard" , "Small falcon; wizard" , "one that cast a spell in Arthur's court" , "Arthur's adviser" , "Camelot's magician or kind of falcon" .)