Europeans excluded - they're quite different (5,5)
I believe the answer is:
poles apart
'quite different' is the definition.
'poles apart' can be an answer for 'different' (thesaurus). I am unsure of the 'quite' bit.
'europeans excluded' is the wordplay.
'europeans' becomes 'Poles' (Pole is an example).
'excluded' becomes 'apart' (I am not sure about this - if you are sure you should believe this answer much more).
'poles'+'apart'='POLES APART'
'they're' acts as a link.
Can you help me to learn more?
(Other definitions for poles apart that I've seen before include "Differing greatly" , "Incompatible" , "Goalposts are" , "Completely different" , "some Europeans?" .)