Europeans make eyepiece with high finish (5)
I believe the answer is:
irish
'europeans' is the definition.
(the people of Ireland)
'eyepiece with high finish' is the wordplay.
'eyepiece' becomes 'iris' (iris is a piece or part of the eye).
'with' is a charade indicator (letters next to each other).
'finish' suggests the final letters.
The final letter of 'high' is 'h'.
'iris'+'h'='IRISH'
'make' acts as a link.
(Other definitions for irish that I've seen before include "of European country" , "Reddish-brown dog" , "Passion" , "From Galway, say" , "Kind of whiskey" .)