Pop group whose name is also a rhyme scheme (4)
I believe the answer is:
abba
'pop group whose name is also a rhyme scheme' 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 "rhyme scheme" , "group of four stars?" , "They used to record" , "Father (used of God in New Testament) - Swedish band" , "Pater's" .)