Swedish pop group (4)
I believe the answer is:
abba
'swedish pop group' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for abba that I've seen before include "rhyme scheme" , "Group winning the 1974 Eurovision Song Contest in Brighton" , "Eurovision prizewinning Swedish pop group" , "rhymes in Petrarchan sonnet" , "Swedish pop music group" .)