Country on the Gulf of Guinea (5)
I believe the answer is:
gabon
'country on the gulf of guinea' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for gabon that I've seen before include "W. Afr. equatorial state" , "West African nation" , "African country, capital Libreville" , "Republic on the west coast of Africa" , "state of Africa" .)