Duck down (5)

I believe the answer is:

eider

This clue is a double definition.

'duck' is the first definition.
(eider is a type of duck)

'down' is the second definition.
(I've seen this before)

(Other definitions for eider that I've seen before include "Duck providing fine down" , "Type of duck" , "Downy sea duck" , "Sea-duck" , "Breed of duck" .)

I've seen this clue in the Penny Press, The Guardian, the LA Times, The Wall Street Journal, The Irish Independent, The Globe and Mail and the King Feature Syndicate.

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