African country's former coin (6)
I believe the answer is:
guinea
I believe this clue is a double definition.
'african country's' is the first definition.
(country in Africa)
'former coin' is the second definition.
(historical type of coin)
(Other definitions for guinea that I've seen before include "Sum of PS1.05" , "Old unit of sterling worth 21 shillings" , "Old British gold coin with a value of 21 shillings" , "State" , "Old piece" .)