Swedish pop band (4)
I believe the answer is:
abba
'swedish pop band' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for abba that I've seen before include "rhymes in Petrarchan sonnet" , "Form of address to deity" , "Palindromic 70s pop group" , "Swedish pop music group" , "Waterloo singers" .)