Is it bad sign to be asked to send some clarification document?

These questions should be posed to your attorney of record who is eminently familiar with all aspects of your asylum case - we are not. Also, he/she was there with you at your asylum interview in Anaheim (and saw and heard everything). That having been said, as a general principle, it is always a good sign when the asylum office asks you to submit additional documents after an interview. But it all depends: did they want you to submit additional "country condition" documents or personal ones. If of a personal nature, that goes into the subjective prong of your asylum application, to determine your credibility. That then might not be very good sign for your case, in that it is now your credibility that is being questioned. But, then again, without more details, you are forcing us to speculate here.. I might completely off. Talk to your attorney!