Nationality of 800m runner world record holder David Rudisha (6)

I believe the answer is:

kenyan

(Other definitions for kenyan that I've seen before include "Person from Nairobi, say" , "Eg, native of Nairobi" , "Nationality of citizen of Nairobi" , "from East Africa?" , "Commonwealth citizen" .)

I've seen this clue in The Times and The Sunday Times.

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