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 Guardian, the King Feature Syndicate, The Wall Street Journal, The Globe and Mail, The Irish Independent, the Penny Press and the LA Times.

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