First book for rock band (7)
I believe the answer is:
genesis
I believe this clue is a double definition.
'first book' is the first definition.
(first book of the Bible)
'rock band' is the second definition.
(I've seen this before)
'for' is the link.
(Other definitions for genesis that I've seen before include "Birth, beginnings" , "Origin -- see sign (anag)" , "Origin; Bible book" , "name of group" , "Origin (of the Old Testament?)" .)