Drifting sheet of frozen water (3,4)

I think it could be either:

Which length description are you looking for?:

3,4

ice floe

(Other definitions for ice floe that I've seen before include "Frozen floating object" , "Floating mass of frozen water" , "Cold sheet" , "Floating sheet formed from glacier" , "Large sheet of frozen water" .)

I've seen this clue in The Times.

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