Crossword Genius

"SOS” quartet (4)

Ross

I believe the answer is:

abba

'sos quartet' 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 "Palindromic 70s pop group" , "Old group" , "Biblical pop" , "Swedish pop band of the 1970s" , "rhyme scheme" .)

I've seen this clue in The Wall Street Journal.
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