He played his first full professional game when he fronted against Central Coast Mariners on 19 January 2008.
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On 28 January, Clark made a double signing, Australian international Dean Heffernan signed until the end of the season from A-League side Central Coast Mariners and young striker Nathan Eccleston signed on a month's loan from Liverpool.
He was signed by the Central Coast Mariners in the A-League for their youth team, and was promoted into the senior team for their round 27 clash against Wellington Phoenix at Westpac Stadium.
He played his 50th game for the Roar in the 4–2 loss against the Central Coast Mariners in Round 3 at Suncorp Stadium in the 2008–09 season.