Nag from Ugandans' divided Arab country? (5)

I believe the answer is:

sudan

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'arab country?' is the definition.

I can't explain the remainder of the clue.

(Other definitions for sudan that I've seen before include "Sun ad for the African state" , "Region of Africa" , "African nation" , "Country south of Egypt" , "Country bordering the Red Sea" .)

I've seen this clue in the Irish Times (Crosaire) and The Irish Times.

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