Crossword Genius

Agnetha, Björn, Benny and Anni-Frid as a group (4)

Ross

I believe the answer is:

abba

(Other definitions for abba that I've seen before include "rhymes in Petrarchan sonnet" , "group of four stars?" , "Bishop" , "Coptic bishop's title; Swedish pop group" , "Palindromic Swedish pop group who sang ` `Waterloo' '" .)

I've seen this clue in The Guardian.
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