Crossword Genius

Polar expedition attire (6)

Ross

I believe the answer is:

anorak

(Other definitions for anorak that I've seen before include "Jacket for an obsessive?" , "Arctic jacket: nerd" , "Boring type's coat" , "Garment; studious person" , "Coat - trivia expert?" .)

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