Hartlepool were struggling to find a way back into the match so manager Newell threw on off-form top scorer E Williams for former Premiership front man Watson on 58 minutes.
They were quickly back in the game five minutes later through the unmarked Clarke's volley and then had further chances to equalise.
Brock saved a low drive from Henderson on 65 minutes and then pulled off an excellent stop from Tinkler's far post shot moments later.
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