Prose about unknown winged beast (6)
I believe the answer is:
osprey
'winged beast' is the definition.
'osprey' can be an answer for 'beast' (osprey is a kind of beast). I am not certain of the 'winged' bit.
'prose about unknown' is the wordplay.
'about' indicates an anagram.
'unknown' becomes 'y' (algebra).
'prose' with letters rearranged gives 'ospre'.
'ospre'+'y'='OSPREY'
Can you help me to learn more?
(Other definitions for osprey that I've seen before include "The fishing eagle" , "Flier" , "Fish eagle" , "Large bird that preys on fish in inland waters" , "A feather trimming (6)" .)