Crossword Genius

Initially named group.. (4)

Ross

I believe the answer is:

abba

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'group' is the definition.
(pop group)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for abba that I've seen before include "Old group" , "Bishop" , "famous pop group" , "Eurovision prizewinning Swedish pop group" , "Biblical pop" .)

I've seen this clue in The Irish Times.
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