@bear78-- Yes, I think so. But I think that you must use the metaphor at length as well. You have to sustain it through the piece of writing for it to really be an extended metaphor.
Using an already popular or common metaphor is extending its use. But I'm not sure if it would qualify as so if you were to use it only once. Probably not.
I think the goal is to tell the story using the metaphor. So for those who don't actually know that a metaphor has been used, they may think that you are talking about something else altogether. It becomes a conceited metaphor.