Crossword Genius

Goose undercooked for unusual person? (4,4)

Ross

I believe the answer is:

rare bird

I'm a little stuck... Click here to teach me more about this clue!

'goose' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe there's an association between them I don't understand?

'undercooked for unusual person?' is the wordplay.
'undercooked' becomes 'rare' (I've seen this in another clue).
'for' means one lot of letters go next to another.
'unusual person?' becomes 'bird' (bird is a kind of person. I am not sure about the 'unusual' bit.).
'rare'+'bird'='RARE BIRD'

Can you help me to learn more?

(Other definitions for rare bird that I've seen before include "Unusual type" , "Exceptional person" , "Exceptional thing" , "the talking point of twitchers?" .)

I've seen this clue in The Sun.
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