Australian bird's hangover symptom? (9)

I believe the answer is:

thickhead

'australian bird's' is the definition.
(bird native to Australia)

I can't explain the remainder of the clue.

(Other definitions for thickhead that I've seen before include "idiot" , "A bird-brained" , "bird?" , "dunce" , "Dope" .)

I've seen this clue in The Times.

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