Famous volume opening for group (7)
I believe the answer is:
genesis
I believe this clue is a double definition.
'famous volume opening' is the first definition.
(book which opens the Old Testament)
'group' is the second definition.
(rock band)
'for' acts as a link.
(Other definitions for genesis that I've seen before include "rock group" , "religious book?" , "Band; book" , "Bible's first book" , "name of group" .)