It may fly a bit furiously! (3)
I believe the answer is:
fur
'it may fly' is the definition.
(reference to the phrase 'make the fur fly')
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for fur that I've seen before include "Hide" , "Eg, sable or ermine" , "Animal-skin coat" , "Animal's coat converted to human use" , "Hair covering animal's body" .)