Advanced African country totally rejected queen (6)
I believe the answer is:
regina
'queen' is the definition.
(Latin for 'queen')
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for regina that I've seen before include "our head of state" , "Title of reigning Queen" , "in Canada" , "Queen in legal issues" , "Queen (in lawsuits)" .)