Waxad qortaa sii wadida faqradan - Wuxuu ka soo muuqday laba iyo toban jeer IAAF World Cross Country Championships laga soo bilaabo 1977 ilaa 1995. shaqsi ahaan, waxqabadkiisa wuxuu yimid 1983 IAAF World Cross Country Championships
, halkaasoo uu kaalinta toddobaad ka galay. Clarke wuxuu saddex jeer ku guuleystay billad qalin ah tartanka (1982, 1987, 1989) wuxuuna sidoo kale ku guuleystay naxaas koox ah 1992, isagoo sharafta la wadaagaya Mike McLeod, Hugh Jones, Julian Goater, Steve Kenyon, Karl Harrison, Carl Thackery, Kevin Forster, Steve Binns, Tim Hutchings, Gary Staines, Richard Nerurkar, iyo Eamonn Martin, iyo kuwo kale.