The Bosnian international scored the only goal of the game in a tight clash at the Etihad Stadium, but the Baggies boss believes that Carlos Tevez should have been flagged offside in the buildup.
Clarke told Sky Sports News: "I am disappointed the decision with the goal went against us, because it was offside. People will say it's a close one but it doesn't matter, it's still offside.
"The linesman has got to get those decisions right. When you come to places like this, playing against teams of the quality of Manchester City, then you need the officials to be good."