Sweet, country's borders? (5)
I believe the answer is:
candy
'sweet' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for candy that I've seen before include "American confectionary" , "Sugary sweet" , "Sweet (US)" , "Girl's name (diminutive)" , "American sweets" .)