Bird with yellow head hidden (5)

I believe the answer is:

raven

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'bird' is the definition.
(raven is a kind of bird)

I can't explain the rest of the clue.

(Other definitions for raven that I've seen before include "Type of crow" , "Crow-like bird" , "Large black bird" , "Passerine bird" , "Black crow" .)

I've seen this clue in The Telegraph.

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