Dee ihe na-esote paragraf a - O mere ngosipụta iri na abụọ na IAAF World Cross Country Championships site na 1977 ruo 1995. N'otu n'otu, ọ rụrụ nke ya na 1983 IAAF World Cross Country Championships
, ebe ọ nọrọ n'ọkwa nke asaa. Clarke bụ onye meriri ọla ọcha ugboro atọ na asọmpi ahụ (1982, 1987, 1989) ma merie ọla nchara otu na 1992, na-ekerịta nsọpụrụ ya na Mike McLeod, Hugh Jones, Julian Goater, Steve Kenyon, Karl Harrison, Carl Thackery, Kevin Forster, Steve Binns, Tim Hutchings, Gary Staines, Richard Nerurkar, na Eamonn Martin, n'etiti ndị ọzọ.