Jet flier (5)
I believe the answer is:
raven
This clue is a double definition.
'jet' is the first definition.
(thesaurus)
'flier' is the second definition.
(raven is a kind of birdanimal)
(Other definitions for raven that I've seen before include "Flighty type" , "Bird of ill omen" , "Passerine bird" , "Flyer" , "Large bird of the crow family" .)