No credit unfortunately for set of beliefs (8)
I believe the answer is:
doctrine
'set of beliefs' is the definition.
(as in religious doctrine)
'no credit unfortunately' is the wordplay.
'unfortunately' is an anagram indicator.
'no'+'credit'='nocredit'
'nocredit' with letters rearranged gives 'DOCTRINE'.
'for' acts as a link.
(Other definitions for doctrine that I've seen before include "Dogma" , "No credit given for set of beliefs" , "Church's policy" , "Set of beliefs taught by church" , "Article of faith" .)