A huge number of chances were squandered in what was, for the most part, a totally one-sided encounter - only for substitute Adam Wykes to pop up with an improbable winner for the visitors with 14 minutes remaining.
"That is football and it is the most frustrating night I've had since being in charge of the reserves," said a naturally unhappy Clive after the game at Stevenage. "I was pleased with the way we played in the first 45 minutes but, when you don't make the advantage count - and we had a massive advantage - you get punished.
We were completely in control of the game with numerous chances
There was poor finishing, I've got to say that, you can't pass up that many opportunities and expect to win a football match.
"I'm sure we won't play another game this season and create as many chances. We should have scored a good number of goals. There are times when you just sense it is going to be an evening of pure frustration and that is exactly what it was.
"You have to take it on the chin because that is the nature of the business. We'll work hard on our finishing and we need to improve on the quality of that. We didn't work the keeper enough considering the number of chances we created."
Our reserve fixture away to Portsmouth, postponed on Wednesday 2 November, has been re-arranged for Tuesday 29 November. The venue remains Havant & Waterlooville FC and kick-off 7pm.
Clive Allen described the 1-0 defeat to Leicester City on Tuesday as an evening of pure frustration.