Crossword Genius

Diving duck

Ross

I think it could be either:

'diving duck' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for eider that I've seen before include "Duck providing fine down" , "Downy sea duck" , "Duck known for down" , "Down comes from this" , "Down-producing duck" .)

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