A nice one bordering country (6)
I believe the answer is:
tirana
'a nice one bordering country' is the definition.
The definition and answer can be both locations as well as being singular nouns.
Maybe you can see an association between them that I don't see?
'nice one bordering country' is the wordplay.
'nice one' becomes 'ta' (both can mean 'thank you!').
'bordering' indicates putting letters inside.
'country' becomes 'Iran' (Iran is an example).
'ta' going around 'iran' is 'TIRANA'.
Can you help me to learn more?
(Other definitions for tirana that I've seen before include "Albanian capital" , "capital city" , "Take a train to the capital of Albania" , "Take a train to Albania's capital (6)" , "foreign capital" .)