Okay, guess it's up to me to answer then. I don't have experience (yet) with these plants, however I've wanted to get them so I have done some research for a small time on them.
No need to clip the apono flower. It just means it is about to go into dormancy, so enjoy the flower and then the plant will look like it is dying. The stems will wilt and die off, etc. That's because in the wild they go through a dry season. In about a month or so it will start growing again.
So if you don't want a tank of aponos that die off at the same time, stagger your planting and you'll always have some green.