Davies has been kept out of the side in recent weeks by the form of Pablo Ibanez, but with the Spaniard suffering a foot against Barnsley, Davies has regained the centre-half position in which excelled last season.
He was back to his best against The Seagulls, alongside Steven Caldwell.
"I thought Curtis was outstanding against Brighton," said Clark. "It was a performance that said no matter who’s fit and no matter how the team are doing 'I’m in the team'.
"That was the response I wanted from a player that hadn’t played in the previous couple of games. He hadn’t sulked when he was out the team. He’d trained fantastically well and when he got his chance again he gave me a push to say 'don’t leave me out ever again' and that’s the response you want."
Davies and his defensive colleagues helped Blues keep a clean sheet against a Brighton side that had previously been unbeaten at home in the league and Clark felt that was testament to the effort they all put in.
"I was delighted with the whole defensive side of the game," he added. "I thought from the attackers back they’ve put in a shift. Brighton made the pitch so big and they pass the ball quickly and can punish you. But bar a couple of occasions down our right hand side with Bridge bombing on and firing in a couple of crosses in they didn’t cause us too many problems.
"Jack (Butland) has done all the basic things extremely well but he hasn’t had to pull off save after save, so that shows that the people in front of him were doing such a terrific job."