Blues were awful in the first half of Saturday's 1-0 home defeat to bottom club Ipswich, before an improved second-half display saw them blow a handful of golden opportunities to snatch at least a point.
The result came after an impressive 1-0 win on the road at Leeds and a brave 3-3 draw away to Millwall having been 3-0 down. City's home form is more mystifying, with a super performance against high-flying Leicester last time out at St Andrew's succeeding abject defeats to Huddersfield and Barnsley.
Speaking after Saturday's loss, Clark said: "The whole first half we just thought we could turn up and play, continue where we left off and try and be a pretty footballing team. You've got to earn the right, got to play high tempo, win battles, win second balls, you've got to compete - and you've got to have every single player doing that.
"When it gets to desperate situations, 15 minutes from the end, we do the things we're expecting from the first minute - we put crosses into the box, we get people running off people going up to head it, all those types of things which we haven't been doing in the first half.
"Do we think we just turn up and these teams just let you play and go and win the game? Of course they don't."