Crossword Genius

Large sea duck (5)

Ross

I believe the answer is:

eider

'large sea duck' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for eider that I've seen before include "Duck from which down is obtained" , "Northern sea duck" , "Down's source" , "Duck supplying down" , "Down-producing duck" .)

I've seen this clue in The Guardian.
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