Clanfield secured all three points at Romanway but steadier finishing would have seen them comfortable victors.
Neil Barrett missed a simple one-on-one with the home keeper, and Chris Hunt was also denied in a similar position.
The only goal of the game came after 42 minutes. Barrett was brought down and Kevin Alcraft confidently slotted home the penalty.
Clanfield had to defend solidly and might have been made to pay for their misses when Nick East's injury-time effort hit the side netting.
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