Harriers' Broughton headed down and straight at Book on 69 minutes when Bennett cleverly flicked on Clarkson's cross.
Cheltenham made their second substitution on 81 minutes when Devaney replaced the on-loan Williams.
Hadley came on in a bid to grab a late winner five minutes from time, replacing Broughton. Stewart Hadley
Shilton wasted a good opportunity on the left hand side two minutes from time with a poor cross that was easily cleared.
Cheltenham made a final change in second half injury time with ex-Hereford man Brough on for Naylor.
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