The Terriers have endured a disappointing week with a 4-2 defeat at Peterborough United being followed by Everton running out 5-1 winners in the Carling Cup.
Town today host Charlton Athletic, who like Clark's Town side were knocked out in the play-off semi-finals last season.
Clark said: "If we are going to be successful, we have to try and keep calm and on a level playing field.
"Ultimately, you are judged over 46 games. We are looking to average two points per game to become a top-two team and I believe that, over the season, we will achieve that goal."
New signing Alan Lee is in the squad following his transfer from Crystal Palace and Clark added: "Alan gave everyone a lift when he trained for the first time on Thursday."