The government has unveiled its new definition of extremism as part of a drive to clamp down on Islamist and far-right extremism. Some have warned the change could have a "chilling effect" on free speech, while others have said it doesn't go far enough. How has the definition changed, why has the government done it, and why is it under scrutiny? Here's everything you need to know. What is the new definition of extremism? The definition describes extremism as "the promotion or advancement of an ideology based on violence, hatred or intolerance" that aims to "negate or destroy the fundamental...