Error ultimately found in typeface that is right for the border (8)
I believe the answer is:
frontier
'the border' is the definition.
(I've seen this before)
'error ultimately found in typeface that is right' is the wordplay.
'ultimately' says to take the final letters.
'found in' is an insertion indicator.
'typeface' becomes 'font' ('font' can be a synonym of 'typeface').
'that is' becomes 'ie' ('i.e.' can be a synonym of 'that is').
'right' becomes 'r' (common abbreviation).
The last letter of 'error' is 'r'.
'r' put inside 'font' is 'front'.
'front'+'ie'+'r'='FRONTIER'
'for' is the link.
(Other definitions for frontier that I've seen before include "Boundary, border" , "Land border of a country" , "wild area" , "Wilderness at the edge of settled territory" , "Border (not yet crossed?)" .)