The best I've found is being able to remove all analysis keywords from a specific subclip. So in your case, you'd need to remove both the one person and the wide shot analysis keywords. To do this:
1. use the list view and go to the clip in question
2. open the disclosure triangle to show the keywords attached to the clip
3. highlight the analysis keywords
4. control(right)-click to get the choice of "Remove Analysis Keywords."
This will remove both keywords and there doesn't appear to be a way to just remove one or the other. Nor can you drag the clip onto an analysis keyword to restore just the one keyword. Stupid, but that's how it works, I suppose.
A potential work-around is to just create your own version of analysis keywords for those you want to still retain. So for example, in your clip, before you remove the analysis keywords, first add your own keyword called "Wide Shot." Then at least you still have that metadata attached.