The girl is partly African, naturally (3)
I believe the answer is:
ann
'the girl' is the definition.
(woman's name)
'partly african naturally' is the wordplay.
'partly' says the answer is hidden in the clue (part of the clue is used).
'ANN' is hidden within 'african naturally'.
'is' is the link.
(Other definitions for ann that I've seen before include "eg Miss Widdecombe" , "... Margret or Hathaway" , "Girl's name" , "Girl" , "woman" .)