Band’s origin (7)
I believe the answer is:
genesis
I believe this clue is a double definition.
'band's' is the first definition.
(Genesis are a rock band)
'origin' is the second definition.
(synonyms)
(Other definitions for genesis that I've seen before include "Origin -- see sign (anag)" , "Origin (of the Old Testament?)" , "religious book?" , "Bible's first book" , "Beginning (in the Bible)" .)