Sun article about session in spa (5)
I believe the answer is:
sauna
'spa' is the definition.
(thesaurus)
'sun article about session' is the wordplay.
'sun' becomes 'S' (abbreviation).
'article' becomes 'a' (English indefinite article).
'about session' becomes 'una' (I can't justify this - if you can you should give a lot more credence to this answer).
's'+'a'+'una'='SAUNA'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for sauna that I've seen before include "A Scandinavian steam bath" , "Very hot cleansing room from Finland" , "Room for steam bath" , "Finnish steam bath" , "Form of steam bath" .)