In the first event of Q School, Clark reached the final round and made breaks of 63 and 59 against Leo Fernandez and won 4–1, a win which gave Clark a two-year card to the World Snooker Tour for the 2015–16 season and 2016–17 seasons. He won his first match by beating Grant Miles 5–1 in the 2015 Australian Goldfields Open qualifiers, before losing by a reverse of this scoreline to Li Hang. At the UK Championship he was knocked out in the first round 1–6 by Mark Davis.&lt;ref name="2015/16"&gt;&lt;/ref&gt; A 5–0 whitewash over Ken Doherty with a high break of 104 saw Clark qualify for the China Open. In Clark's first appearance at a Chinese ranking event he won a match at a venue for the first time by beating Davis 5–4. In the next round Clark made breaks over 50 in each of the four frames he won, but was edged out 4–5 by Alfie Burden. His first season as a professional ended with an opening round 5–10 defeat to David Gilbert in World Championship qualifying.