Transvaal settler (4)
I believe the answer is:
boer
'transvaal settler' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for boer that I've seen before include "South African of Dutch ancestry" , "Dutch S. African settler" , "South African such as President Kruger" , "White South African of Dutch descent" , "Afrikaner" .)