A bird called Ida (5)

I believe the answer is:

eider

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

I don't understand the rest of the clue.

(Other definitions for eider that I've seen before include "Duck valued for its fine soft down" , "Down-producing duck" , "ie Red (anag.)" , "Variety of duck" , "Reed I turn into a duck" .)

I've seen this clue in the Evening Standard.

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