Perch for a polar bear (4)

I believe the answer is:

floe

(Other definitions for floe that I've seen before include "A large lump of floating ice" , "Comparatively small piece of floating ice" , "Flat mass of sea ice" , "Separated piece of ice on water" , "Sheet of ice floating in the sea" .)

I've seen this clue in The Wall Street Journal.

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