Terms for the US border accepted by examiners (10)
I believe the answer is:
trimesters
'terms' is the definition.
(I know this)
'border accepted by examiners' is the wordplay.
'border' becomes 'rim' (both can mean an edge).
'accepted by' indicates putting letters inside (inserted letters are accepted).
'examiners' becomes 'testers' ('tester' can be a synonym of 'examiner').
'rim' inserted within 'testers' is 'TRIMESTERS'.
'for the us' acts as a link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for trimesters that I've seen before include "Terms" , "quarters" .)