"Dancing Queen" band (4)
I believe the answer is:
abba
'dancing queen 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 "Bishop" , "group of four stars?" , "1970s Swedish pop group" , "Palindromic 70s pop group" , "Swedish pop band of the 1970s" .)