Disregarded Ashes hero Stuart Clark claimed four West Australian wickets in his first 12 balls, including a hat-trick, and then declared himself still in contention for the World Cup squad.

Playing for New South Wales in Perth because of his axing from the Australian one-day team, Clark again showed his potential to devastate, with a two over burst which could be crucial to the Blues' chances of reaching the Pura Cup final.

And after reducing WA to 4-17 at the close - picking up Chris Rogers, Marcus North, Adam Voges and Steve Magoffin - Clark admitted he had been disappointed to be dropped from Australia's one-day set up following his superb Test series.

"It is obviously disappointing when you get left out of any team, but I tried not to think about it today," said Clark who was also left out of the Chappell-Hadlee one-day series in New Zealand starting next week.

"It is hard because the games are on and I am watching them on TV ... but all I can do is go out and play cricket and do well, if I do well I am a chance to be in that 15.

"I personally think I am in the best 15, but it is not my decision. I'd love to be in the World Cup 15 and I think can do a job that can be great for the team.

"As far as trying extra hard, I think that is the worse possible thing I can do. Hopefully I can get some results that can get me picked in the team next week."

After NSW had struggled to 270, Clark bowled with pace, bounce, and in a perfect area on a green tinged wicket, dismissing Rogers, the country's top run scorer, first ball, before inducing North to an identical shot and result with his 10th.

Adam Voges - himself in the reckoning for the Word Cup after a call up for the Chappell-Hadlee trophy - found the same cordon with the next delivery, and nightwatchman Steve Magoffin had no answer to give Clark his first career hat-trick.

"Maybe (I took one) when I was ten or twelve, but not since then," Clark said.

"I have been on two wickets a few times but I usually bowl a ridiculously poor ball way down leg side or way over the batter's head or something."

Before the 31 year-old's decisive intervention, NSW appeared to have ruined a great chance to claim a big headstart in the race with WA for the Pura Cup final, losing their last six wickets for 96 runs.

Phil Jaques (71) and Brad Haddin (57) were the standouts, with Simon Katich's 46 notable for its discipline but certainly not its shot making.

WA had its chances to dismiss both NSW's top scorers in single figures, with Voges shelling Jaques and Justin Langer grassing Katich at either ends of the morning session.

Katich eventually fell 15 minutes shy of four hours in the middle, leaving a Magoffin ball that bowled him behind his legs, but it mattered not to Haddin, who brought up his fifty with a six off Aaron Heal.

But when Haddin fell six runs later to a brilliant take by Luke Ronchi behind the stumps, NSW fell away, with only Grant Lambert's late 49 allowing them to pass 250.

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