Bird is yellow, except head (5)
I believe the answer is:
raven
'bird' is the definition.
(raven is a kind of bird)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for raven that I've seen before include "Jet-black" , "Poe's poetic bird" , "pig" , "Black crow" , "Bird in 1's poem" .)