Roman queen overturns a country in Africa (6)

I believe the answer is:

regina

I'm a little stuck... Click here to teach me more about this clue!

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

'overturns a country in africa' is the wordplay.
'overturns' shows that the letters should be reversed in order.
'country in africa' becomes 'Niger' (African nation).
'a'+'niger'='aniger'
'aniger' backwards is 'REGINA'.

Can you help me to learn more?

(Other definitions for regina that I've seen before include "Canadian city" , "Victoria?" , "in Canada" , "monarch" , "Queen in legal issues" .)

I've seen this clue in The Irish Times and The Guardian.

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