"Mamma Mia” group (4)

I believe the answer is:

abba

'mamma mia 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 "Enclosed rhyme" , "Eurovision prizewinning Swedish pop group" , "Father (NT)" , "striped coat?" , "They used to record" .)

I've seen this clue in the USA Today, the Universal, the King Feature Syndicate and the Newsday.

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