Steam room (5)
I believe the answer is:
sauna
'steam room' is the definition.
(I know that sauna is a type of steam room)
This is all the clue.
(Other definitions for sauna that I've seen before include "Sweat room" , "Very hot cleansing room from Finland" , "Where one is sweaty" , "Very hot room for cleansing, of Finnish origin" , "Scandinavian hot room for cleansing oneself" .)