A flier like Ida (5)

I believe the answer is:

eider

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'a flier' is the definition.
(eider is a kind of birdanimal)

I don't understand how the remainder of the clue works.

(Other definitions for eider that I've seen before include "Type of duck" , "Down comes from this" , "Down-producing duck" , "Duck valued for its fine soft down" , "Duck known for down" .)

I've seen this clue in the Evening Standard.

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