Acronymic Swedish band (4)
I believe the answer is:
abba
'acronymic swedish band' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for abba that I've seen before include "Eurovision winners" , "Palindromic 70s pop group" , "Bishop" , "Form of address to deity" , "group of four stars?" .)