There are two ways to remove the clip:
1) Open up the head and remove the clip. Good luck getting it open. I wasn't able to bust through the locktite, but you may have better luck.
2) If you can't get the head open, just break the clip off and file/dremel the rest down smooth. This can be a little tricky.
Either way, the leftover slot just happens to be a wonderful size for a trit. :naughty:
If you have the choice, I do recommend going for the no clip version, as rotating the head has the nasty side effect of causing the clip to scratch the tailcap.