Nijel Amos represented this African country in London in 2012 when winning their first Olympic medal (8)

I believe the answer is:

botswana

(Other definitions for botswana that I've seen before include "Boa wasn't, strangely, in the African state" , "Landlocked southern African country, capital Gaborone" , "Boa wasn't taken out in the African state" , "Does the African state want ASBO?" , "Africa country, until 1966 called Bechuanaland" .)

I've seen this clue in The Times.

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