Sentence:  QAnon, whose supporters also call it “The Storm" or “Great Awakening,” is a wide-ranging <WSD>conspiracy theory</WSD> that burst into greater visibility this summer, after supporters at a Trump rally wearing Q shirts prompted a rush of national media coverage about it. 
Meaning of the word marked with <WSD> tags:  A hypothesis alleging that the members of a coordinated group are, and/or were, secretly working together to commit illegal or wrongful actions including attempting to hide the existence of the group and its activities. In notable cases the hypothesis contradicts the mainstream explanation for historical or current events. (1960s)