Issue of Oxford University book retaining copyright (7)
I believe the answer is:
outcome
'issue' is the definition.
(I know that issue can be written as outcome)
'oxford university book retaining copyright' is the wordplay.
'oxford university' becomes 'OU'.
'book' becomes 'tome' (a tome is a book).
'retaining' indicates putting letters inside (inserted letters are held or retained).
'copyright' becomes 'C' (as in the copyright symbol, a C in a circle).
'tome' enclosing 'c' is 'tcome'.
'ou'+'tcome'='OUTCOME'
'of' is the link.
(Other definitions for outcome that I've seen before include "End result" , "'Result, upshot (7)'" , "Cute moo (anag.)" , "Consequence, upshot" , "answer" .)