Politician managed to entertain European known to all (10)
I believe the answer is:
republican
'politician' is the definition.
(Republican is an example)
'managed to entertain european known to all' is the wordplay.
'managed' becomes 'ran' (I've seen this before).
'to entertain' is an insertion indicator.
'european' becomes 'e' (abbreviation e.g. EU).
'known to all' becomes 'public'.
'e'+'public'='epublic'
'ran' placed around 'epublic' is 'REPUBLICAN'.
(Other definitions for republican that I've seen before include "American in party" , "anti-monarchist" , "in foreign party" , "Member of US political party" , "American politician" .)