"Super Trouper” group (4)
I believe the answer is:
abba
'super trouper group' 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 "Waterloo singers" , "rhymes in Petrarchan sonnet" , "Enclosed rhyme" , "Father (used of God in New Testament) - Swedish band" , "They used to record" .)