Between 1996 and 2000, Clarke held a scholarship with the Australian Institute of Sport. He was an official torch bearer at the Opening Ceremony of the Paralympic Games in Sydney in 2000 and competed in the Men's Up To 90kg event. He was defeated by ippon in the &lt;a href="Single-elimination%20tournament"&gt;1/8 final&lt;/a&gt; by Ian Rose (GBR).At the 2004 Summer Paralympics in Athens, Clarke competed in the Men's Up To 90kg event, but was defeated by Oleg Kretsul (RUS) by ippon in the quarter-final.