Sun article about a Finnish bath (5)
I believe the answer is:
sauna
'finnish bath' is the definition.
(I've seen this in another clue)
'sun article about a' is the wordplay.
'article' becomes 'a' (the indefinite article in English).
'about' is an insertion indicator.
'sun'+'a'='suna'
'suna' placed around 'a' is 'SAUNA'.
(Other definitions for sauna that I've seen before include "A Scandinavian steam bath" , "Finnish-style bath" , "Finnish steam bath" , "Where one is sweaty" , "Scandinavian hot room for cleansing oneself" .)