Crossword Genius

Sheet of drifting ice (4)

Ross

I believe the answer is:

floe

(Other definitions for floe that I've seen before include "Separated piece of ice on water" , "Broken piece of pack-ice" , "Floating flat mass of ice" , "Flat mass of sea ice" , "A field of floating ice" .)

I've seen this clue in The Times.
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