A role set by Europeans is very different (5,5)
I believe the answer is:
poles apart
'very different' is the definition.
(I've seen this before)
'a role set by europeans' is the wordplay.
'role' becomes 'part' ('part' can be a synonym of 'role').
'set by' is a charade indicator (letters next to each other).
'europeans' becomes 'poles' (Pole is an example).
'a'+'part'='apart'
'apart' put after 'poles' is 'POLES APART'.
'is' is the link.
(Other definitions for poles apart that I've seen before include "Unlikely to meet" , "Quite opposite" , "Completely different" , "having nothing in common" , "with widely differing views" .)