Jack’s old-fashioned bird (3)

I believe the answer is:

daw

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This clue could be a double definition.

'jack's old-fashioned' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'bird' is the second definition.
(daw is a kind of bird)

Can you help me to learn more?

(Another definition for daw that I've seen is " Bird of the crow family".)

I've seen this clue in the Evening Standard.

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