Note bird going over beast (6)
I believe the answer is:
animal
'beast' is the definition.
(a beast is an animal)
'note bird going over' is the wordplay.
'note' becomes 'la' (musical note as in do-re-mi).
'bird going' becomes 'mina' (I can't explain this - if you can you should believe this answer much more).
'over' says the letters should be written in reverse.
'la'+'mina'='lamina'
'lamina' backwards is 'ANIMAL'.
Can you help me to learn more?
(Other definitions for animal that I've seen before include "Such as 13 ac" , "I''m Alan (anag) - a wild, crazy person" , "See 26" , "Beast from Manila" , "cat, perhaps" .)