A cattle-rearing people of southern Africa, living chiefly in South Africa (5)

I believe the answer is:

xhosa

(Other definitions for xhosa that I've seen before include "South African cattle-rearing people" , "Cattle-rearer in South Africa" , "Tribesman" , "South African language spoken with clicks" , "South African tribe" .)

I've seen this clue in The Independent.

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