West African country — old British gold coin (6)

I believe the answer is:

guinea

I believe this clue is a double definition.

'west african country' is the first definition.
(country in West Africa)

'old british gold coin' is the second definition.
(I've seen this before)

(Other definitions for guinea that I've seen before include "twenty one shillings" , "One pound and fivepence" , "so-called pig that's experimentally tested?" , "Old money and pig" , "Coastal region in West Africa, equal to 21 shillings" .)

I've seen this clue in The Guardian.

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