Crossword Genius

Lots of steam initially scalded a woman (5)

Ross

I believe the answer is:

sauna

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'lots of steam' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'initially scalded a woman' is the wordplay.
'initially' indicates taking the first letters.
'woman' becomes 'una' ().
The first letter of 'scalded' is 's'.
's'+'a'+'una'='SAUNA'

Can you help me to learn more?

(Other definitions for sauna that I've seen before include "Type of bath" , "Steam-bath" , "Scandinavian hot room for cleansing oneself" , "Very hot cleansing room from Finland" , "Room for steam bath" .)

I've seen this clue in The Daily Express and The Mirror.
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