But can that be possible ?
If you have asked a question in musing, then there is no option under that question to answer and that option is available for all others except you. So even if you try to answer your own question, you can not do that in musing because there is no such button to trigger your answer. So in my opinion that is not possible.
If you mean something else which I am not being able to understand then you can further clear that, so that I can respond in a better way.