Strategy mostly pursued by a country in Africa (6)
I believe the answer is:
gambia
'country in africa' is the definition.
(African nation)
'strategy mostly pursued by a' is the wordplay.
'strategy' becomes 'gambit'.
'mostly' means to remove the last letter (most but not all of the word).
'pursued by' means one lot of letters go next to another.
'gambit' with its final letter taken off is 'gambi'.
'gambi'+'a'='GAMBIA'
(Other definitions for gambia that I've seen before include "West African country surrounded by Senegal" , "Aim bag toward African state" , "West African river" , "West African country, capital Banjul" .)