African in Khartoum, a sailor (5)
I believe the answer is:
masai
'african' is the definition.
(the Masai are an ethnic group of Kenya)
'in khartoum a sailor' is the wordplay.
'in' indicates the answer is hidden within the clue.
'MASAI' is hidden within 'khartoum a sailor'.
(Other definitions for masai that I've seen before include "Africans" , "Member of an African pastoral people" , "Price increase" , "Highlander in Africa" , "Kenyan language" .)