Bird that is a raw beginner (6)
I believe the answer is:
rookie
'a raw beginner' is the definition.
'rookie' can be an answer for 'beginner' (rookie is a kind of beginner). I am unsure of the 'a raw' bit.
'bird that is' is the wordplay.
'bird' becomes 'rook' (rook is a kind of bird).
'that is' becomes 'ie' (abbreviation for id est, 'that is' in Latin).
'rook'+'ie'='ROOKIE'
Can you help me to learn more?
(Other definitions for rookie that I've seen before include "new team member" , "New (police) recruit (colloq.)" , "untrained soldier" , "inexperienced fighter" , "Callow recruit" .)