Chances were few and far between at Havant & Waterlooville's Westleigh Park in the lads' first fixture in the Barclays Reserve League South since December 4.
Pompey had two clear-cut opportunties and took one as Franck Songo'o's clean strike into the bottom corner from the edge of the box after 36 minutes proved enough for the points.
We enjoyed plenty of possession but failed to convert that into chances, a point Clive highlighted afterwards. "We attacked the game in the right way, got into good positions in the final third of the pitch but didn't produce the quality needed to create a clear-cut opportunity to score," he reflected.
"Defensively we were sound and we only gave up two chances - one cost us the goal, the other was missed.
"On the balance of play we deserved something from the game but we've said that a number of times this season and it's something we have to address for the rest of the season.
"We never like to lose but we'll look at the reasons why and try to take the positives. We had good phases of play without that extra quality which would have made a big difference. That's why we've suffered a few 1-0 defeats recently and it's something we have to put right.
"It was a much-needed fixture. The lads have trained hard and to return to a game with a competitive edge was very important. We now have a run of games and I think we'll be better for it. I'm sure we'll improve."
Clive Allen felt a lack of cutting edge cost the reserves at Portsmouth on Tuesday night but is convinced his side will improve with regular games for the rest of the campaign.