One area to the east of one country and another (7)
I believe the answer is:
nigeria
'and another' is the definition.
I can't tell whether this definition defines the answer.
'one area to the east of one country' is the wordplay.
'one' becomes 'I' (Roman numeral).
'area' becomes 'a' (maths abbreviation).
'to the east of' says to put letters next to each other (some letters go to the right of others).
'one country' becomes 'niger' (African country).
'i'+'a'='ia'
'ia' after 'niger' is 'NIGERIA'.
Can you help me to learn more?
(Other definitions for nigeria that I've seen before include "Possible home for African" , "African country, capital Abuja" , "W. African country" , "Land in Africa" , "part of Africa" .)