— Desert, arid plateau of South Africa, Namibia and Botswana (8)

I believe the answer is:

kalahari

(Other definitions for kalahari that I've seen before include "Desert of south-west Africa" , "SW African desert" , "Southern African desert" , "This desert is a barren plateau in Botswana" , "Southwestern African desert" .)

I've seen this clue in The Mirror.

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