Clarke told the club's official website: "We showed today we can play some good football. We knocked the ball around well and I thought it was a good passing game between two teams that could pass the ball and try to play football in the right way.
"Swansea on the day had a little bit more of a cutting edge than we did – and I think that was the difference.
"There were couple of chances we had before they scored - and if they go in it's a different game."
West Brom are currently bottom of the Premier League after three games this season.