One country or another on the borders of India (7)
I believe the answer is:
nigeria
'one country' is the definition.
(I know that Nigeria is a country)
'another on the borders of india' is the wordplay.
'another' becomes 'niger' (I am not sure about this - if you are sure you should believe this answer much more).
'on' says to put letters next to each other.
'the borders of' suggests removing the centre.
'india' with its middle removed is 'ia'.
'niger'+'ia'='NIGERIA'
'or' is the link.
Can you help me to learn more?
(Other definitions for nigeria that I've seen before include "Possible home for African" , "W. African country" , "West African nation" , "In rage I turn to this country" , "part of Africa" .)