Crossword Genius

Jan —, prime minister of South Africa from 1939-48 (5)

Ross

I believe the answer is:

smuts

(Other definitions for smuts that I've seen before include "Specks of soot - South African statesman, d. 1950" , "South African field marshal and premier" , "signs of pollution" , "In South Africa general" .)

I've seen this clue in The Mirror.
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