Contracting sheet (6)

I believe the answer is:

icecap

(Other definitions for icecap that I've seen before include "Cold sort of headwear found in Greenland" , "mass covering the top of Everest?" , "Snowy mountain peak" , "hard water area" , "Permanent coating of white on a mountain-top" .)

I've seen this clue in The New York Times.

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