Crossword Genius

Heavy quilt (9)

Ross

I believe the answer is:

eiderdown

(Other definitions for eiderdown that I've seen before include "what keeps retired people warm" , "thermal insulation" , "Soft quilt filled with duck feathers" , "What might keep one warm" , "what ducks have to offer us" .)

I've seen this clue in the Sydney Morning Herald.
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