Cheltenham's first goal arrived via a corner after goalkeeper Liam Roberts dropped the ball allowing captain Ben Tozer to tap the ball home from close range and, following Josh Gordon's second-half penalty had put the Saddlers back on level terms, Liam Kinsella then saw a pass to Alfie Bates fall short allowing Luke Varney to put the Robins back into the lead.
The result marks the Saddlers' third defeat in a row - following on from the recent losses to Salford City and Leyton Orient - and means the upcoming midweek clash with Oldham Athletic has taken on more importance as the Reds look to return to winning ways.
Mansfield-born Clarke admitted he was frustrated with the team's overall display but insisted he takes responsibility for the recent bad run of form, further admitting that his team is far from the finished article following a summer of major change at Banks's Stadium.
Speaking to the assembled media, Darrell said; "You don’t need me preaching again this week, it’s not good enough. Mentality, poor, maybe four or five did themselves sort of justice.
"Poor from us, but I take full responsibility, we’re miles away from being a successful team in League Two. Miles away, let’s not beat around the bush.
"There’s a fear factor at home at the minute, I understand that, I don’t blame the fans for that. I blame myself for that because the mentality of the players is something I touch on all the time.
"When the chips are down, we chuck them a goal don’t we. Last thing you need to do when you’re on a bad run at home, backs are against the wall, you score a goal and then you give them another sloppy goal. We’re killing ourselves."