Crossword Genius

Sea duck (5)

Ross

I believe the answer is:

eider

'sea duck' is the definition.
(eider is a kind of sea duck)

This is the entire clue.

(Other definitions for eider that I've seen before include "Duck from which down is obtained" , "Duck supplying down" , "Reed I turn into a duck" , "I've noted down" , "Duck with soft feathers" .)

I've seen this clue in The Sun, The Independent, the Sydney Morning Herald, The Mirror, The Telegraph, the Evening Standard and The Times.
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