A country in Africa rejected by Roman queen (6)

I believe the answer is:

regina

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'roman queen' is the definition.
'regina' can be an answer for 'queen' (Latin for 'queen'). I am not sure about the 'roman' bit.

'a country in africa rejected by' is the wordplay.
'country in africa' becomes 'niger' (African nation).
'rejected' is a reversal indicator.
'by' says to put letters next to each other.
'niger' reversed gives 'regin'.
'a' put after 'regin' is 'REGINA'.

Can you help me to learn more?

(Other definitions for regina that I've seen before include "Queen (in lawsuits)" , "Queen (Latin)" , "ER, Elizabeth ..." , "Something inserted" , "Reigning queen's title" .)

I've seen this clue in The Irish Times.

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