In the US, if you say Apple Cider then it's non-alcoholic non-filtered apple juice. If you say Hard Cider, it's the alcoholic stuff. If you just say cider, it's context specific. Say it at an orchard or a breakfast place or a fall festival, it's going to be assumed to mean the cloudy apple juice. Say it at a bar or non-breakfast restaurant or at a party and it'll be assumed to mean the alcoholic one. Generally the only time one needs to clarify is if you ask someone to grab some cider from the store.