Clingan along with Michael McIndoe playing at left back, was involved in a game which saw Cheltenham take the lead in the 21st minute. Shaun Jeffers playing against his parent club, had a shot saved and Theo Lewis scrambled in Frankie Artus' near post corner.
Clingan forced Lloyd Weston into a good save diving to his left before Walsh and then Jeffers who was in good form, headed a free kick wide of the far post.
At the other end, Roy O'Donovan, who was once at Whaddon Road on trial, struck a post before the half ended with Cheltenham still ahead.
Just after the restart, Clingan sent a 25 yarder crashing against the bar and City struck the woodwork again for a second time shortly afterwards.
But in the 66th minute, a quality strike from Shaun Jeffers sent the ball high into the corner of the net for the second Cheltenham goal.
Report compiled with thanks to JP from This Is Gloucestershire, who was allowed in.