The origin of a pop group (7)

I believe the answer is:

genesis

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This clue could be a double definition.

'the origin' is the first definition.
('genesis' can be a synonym of 'origin')

'pop group' is the second definition.
'genesis' can be an answer for 'group' (rock band). I'm not sure about the 'pop' bit.

'of a' acts as a link.

Can you help me to learn more?

(Other definitions for genesis that I've seen before include "Beginning (in the Bible)" , "Origin (of the Old Testament?)" , "OT opening" , "First book of the Old Testament" , "name of group" .)

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