Name encapsulates a new European river (6)
I believe the answer is:
danube
'river' is the definition.
(Danube is an example)
'name encapsulates a new european' is the wordplay.
'name' becomes 'dub' (as in dubbing someone with a particular name).
'encapsulates' means one lot of letters goes inside another.
'new' becomes 'n' (abbreviation as in New Testament NT).
'european' becomes 'e' (abbreviation e.g. EU).
'a'+'n'='an'
'dub' going around 'an' is 'danub'.
'danub'+'e'='DANUBE'
(Other definitions for danube that I've seen before include "Ban due (anag) - river" , "Viennese river" , "River in Europe" , "River flowing through Belgrade, Budapest and Vienna" , "River flowing from Black Forest to Black Sea" .)