Ring obtained over in West African state (4)
I believe the answer is:
togo
'west african state' is the definition.
(country in West Africa)
'ring obtained over' is the wordplay.
'ring' becomes 'o' (letter resembling a ring).
'obtained' becomes 'got' ('get' can be a synonym of 'obtain').
'over' is a reversal indicator.
'o'+'got'='ogot'
'ogot' in reverse letter order is 'TOGO'.
'in' is the link.
(Other definitions for togo that I've seen before include "African country E. of Ghana" , "Remaining united" , "French-speaking West African country, capital Lome" , "territory of some West Africans" , "place in Africa" .)