Hello Steve,
I think that you are ranking higher for the term on other search partners of google. One of my customer had this situation when they were getting clicks from some unknown source. We later on found that they were ranking high on google and msn search partners.
There is a good chance but I would still suggest that you check your weblogs.
I will also suggest using marketleap for tracking your backlinks. You might also be getting backlinks from some high ranking website in your niche.
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