Book group (7)

I believe the answer is:

genesis

I believe this clue is a double definition.

'book' is the first definition.
(first book of the Bible)

'group' is the second definition.
(rock band)

(Other definitions for genesis that I've seen before include "Origin (of the Old Testament?)" , "Origin -- see sign (anag)" , "Beginning the holy book" , "rock band" , "religious book?" .)

I've seen this clue in The Telegraph.

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