New release concerning contentious topic (7)
I believe the answer is:
reissue
'new release' is the definition.
(release or publication of something)
'concerning contentious topic' is the wordplay.
'concerning' becomes 're'.
'contentious topic' becomes 'issue' (as in a controversial issue).
're'+'issue'='REISSUE'
(Other definitions for reissue that I've seen before include "Bring out again" , "Put out (eg, book) again" , "Send out again" , "publication (not a first!)" , "get book brought out again" .)