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(I first tried de-activating Open Directory because that would be one of the main sources I would use in clustering).
In fact, it is a summary of Teoma's "Refine" after pressing "show all refinements" as far as I can check.
Maybe I'm searching in the wrong ixquick, but if I opt-out of Ask Jeeves/Teoma in Ixquick, I get no clustering.
Try a typical clustering check search such as "Jaguar".
In Teoma click on "Show All Refinements".
The results seem the same (albeit limited in number).
Another good check is "Ford", Vivisimo is better (click on more) in that it also presents Harrison Ford, the Ford Foundation etc.