Although disappointed by the penalty decision that went against his side - Jacques Maghoma penalised for an accidental trip on Jimmy Smith that looked outside the box and then sent off as he was deemed the last man - development coach Clive accepted that his side just didn't get going on the night.
Franco Di Santo drilled home that penalty after 55 minutes and went on to complete a hat-trick with goals after 74 minutes and a second penalty eight minutes from time.
However, an experienced Blues side always had the upper hand with the likes of Tal Ben Haim, Steve Sidwell, Paulo Ferreira and £9million January arrival Branislav Ivanovic all starting.
"Chelsea brought a very experienced side, had a lot of quality and it was always going to be a difficult game for us," reflected Clive at Orient.
"I'm disappointed in the way we played particularly in the first half and then the penalty decision changed the course of the game - Jacques Maghoma was sent off and I think it was very unfortunate.
"They then controlled the game, used all their experience, maintained possession, picked us off and ran out comfortable victors and we have to accept that.
"We will certainly look carefully at what we did up to the point of the penalty and there are lessons to be learnt in how to cope in those situations.
"I thought our shape was good and we made it difficult for them but they had opportunities when we became lopsided defensively and were a little too deep and the quality players they had were waiting for those opportunities.
"It was a test for us and we have to learn from it but we've had a good spell and we can't get too disheartened."
Clive Allen took a pragmatic view of Monday night's reserve loss against Chelsea.