Here is a sample question. What is Clustered Index? 
I think this should be a community wiki question, because PO not pointing any particular issues, just want explanation!
I'm not sure to make it as CW, as its bit old and answered.
Please post your thoughts on this...
Possibly, but be careful -- "what is a clustered index?" might be the wrong sort of question.
http://blog.stackoverflow.com/2011/02/are-some-questions-too-simple/
(source: stackoverflow.com)
We have provided some additional guidance at the blog:
http://blog.stackoverflow.com/2011/08/the-future-of-community-wiki/
TL;DR version
Most of the time, you should be asking yourself “How can I improve this post so that community wiki isn’t needed?” Community wiki is like a cheese knife: it is a specialized tool to be used sparingly, and only in very specific circumstances.
Perhaps it is a good idea. I was looking for ways to convert nonclustered primary keys into primary keys and thereby I searched all question aboout clusterd indexes and noted that this one was missing the obvious tag and I added it.
Converting it to a CW gives the opportunity to link to further related questions like this, which shows, that instead of converting the primary key, I can just add a clustered index.
Technically there seem to be the possibility to change a question into a CW or a single answer. In this case it might be the question which to convert into a CW.
