Group correctly spelled with a backward B (4)

I believe the answer is:

abba

(Other definitions for abba that I've seen before include "group of four stars?" , "Coptic bishop's title; Swedish pop group" , "Palindromic Swedish pop group who sang ` `Waterloo' '" , "Swedish artists" , "Father (used of God in New Testament) - Swedish band" .)

I've seen this clue in the Newsday.

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