A sweater made in Scandinavia? (5)

I believe the answer is:

sauna

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'a sweater' is the definition.
(saunas make people sweat)

I cannot understand how the remainder of the clue works.

(Other definitions for sauna that I've seen before include "Steam-heated room" , "Form of steam bath" , "Very hot cleansing room from Finland" , "Very hot room for cleansing, of Finnish origin" , "Finnish steam bath" .)

I've seen this clue in the Evening Standard.

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