The Saddlers made a tremendous start to the game and were three goals up within thirty-one minutes of kick-off as they netted via a Pierce Sweeney own goal, Caolan Lavery's seventh of the season, and Josh Gordon's sixth of the campaign.
But the second-placed Grecians battled back with two Ryan Bowman goals before half-time before former Manchester United winger Lee Martin equalised eighteen minutes into the second-half, sparing his side's blushes as their recent unbeaten spell appeared to be coming to an end.
Mansfield-born Clarke sought to point out the positives but was ultimately disappointed as his team let slip a comfortable lead to take just a point form a long away trip to Devon.
Speaking to the assembled media, Darrell said; "We’re obviously disappointed. Let’s not kid ourselves, we were three-nil up. We have to give Exeter credit, that’s why they’re in the top seven.
"We get ourselves in a very healthy position and then our defending at the back end of the first half was shocking. We re-grouped at half-time. I thought the tactical change helped the team in all honesty.
"Their third goal comes from a little bit of fortune and we’re in it all the way with chances at the end of the game. We appreciate the fans coming down a long way, great support again today. We’re disappointed not to get the three points."