There were murmurings from supporters about signing the former West Brom man, prior to him joining the club.
But the 33-year-old defender has shown he is still an extremely fit and dedicated performer and a real asset to the side.
"I think Paul has shown everybody how committed he is," said Clark.
"There were question marks about him from some people when he first came through the door about whether he be would be committed to the club because of past history, but not from me.
“I said then that he has been committed to any club he has played for because he's that type of lad. He has subsequently shown that on every occasion he has played in the team.
"The good thing about Paul as well is that for someone of his experience, he can handle the setbacks that happen in the game as well.
"Sometimes when youngsters have a setback it knocks them a little bit sideways for a while, but Paul realises you have quickly got to get on with the game and move forward again."