Book for every graduate in group (9)
I believe the answer is:
paperback
'book' is the definition.
(paperback is a kind of book)
'every graduate in group' is the wordplay.
'every' becomes 'per' (I've seen this in other clues).
'graduate' becomes 'ba'.
'in' is an insertion indicator.
'group' becomes 'pack' (pack is a kind of group**).
'per'+'ba'='perba'
'perba' placed inside 'pack' is 'PAPERBACK'.
'for' is the link.
(Other definitions for paperback that I've seen before include "Book with soft cover" , "Publication" .)