Blues’ positive start in Wolverhampton was extinguished by Marlon King’s unfortunate own goal in the 33rd minute, and that proved the pivotal moment in the West Midlands derby.
Clark also bemoaned the fact of the influential Jonathan Spector coming off with an ankle injury at half-time.
The Blues boss told bcfc.com: “I thought we played very good football. We passed it around and we were energetic. The two youngsters in the wide positions did extremely well. We were creating problems and we were the dominant team.
“The only time in the game that we got caught up was (when) Wolves scored an offside goal. For the first time in the half the crowd got a little bit noisy and we got caught up in that. We tried to take a quick free-kick and gave possession back to Wolves and then we give a cheap free-kick away and obviously we haven’t defended very well. It comes off the inside of Marlon’s foot and it’s in the goal.
“We continued the half in the same vein. Obviously we lost Jonathan Spector which was a blow, and I think that contributed to the game being a bit more open in the second-half.
“We had opportunities but certainly over the course of the game, from start to finish, I think we can feel hard done, but I’d rather say we haven’t played particularly well and we’ve won.”
As well as the problem Spector picked up at Molineux, Clark is also sweating over the fitness of a number of other squad members.
He added: “With Jonathan it’s not an impact injury and is a result of the way he landed going up for a header. On top of that we lost Pablo Ibanez (shin) and Nikola Zigic (back) before the game and Curtis (Davies) picked up a twist at the end, hopefully it’s not too serious because we are short.”