Do you hear at least a click from the engine area? If so, direct your thinking toward starter motor issues. Otherwise, it's "other", and the clutch switch is as good a place to start as any. I'm not sure where that switch is, but it should be easy enough to spot with a flashlight, and perhaps operate it manually and/or test it with a meter. If it tests OK, is there anything new that might be obstructing it? Perhaps a different set of foot mats for the winter?