Modest European among varied credits (8)
I believe the answer is:
discreet
'modest' is the definition.
(thesaurus)
'european among varied credits' is the wordplay.
'european' becomes 'e' (abbreviation e.g. EU).
'among' is an insertion indicator.
'varied' indicates an anagram.
'credits' is an anagram of 'discret'.
'e' placed into 'discret' is 'DISCREET'.
(Other definitions for discreet that I've seen before include "Careful in not attracting attention" , "Cautious, doesn't give away secrets" , "Diplomatic" , "Intentionally unobtrusive" , "Doesn't give away secrets - can be trusted" .)