A snow bridge may conceal it (8)

I believe the answer is:

crevasse

(Other definitions for crevasse that I've seen before include "climbing hazard in glacier" , "Crack in a mountain slope or a glacier" , "Deep glacial fissure" , "Sever sac (anag)" , "13 in a glacier" .)

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

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