Quran Being Tafseel Of Al Kitaab
I think this is a good way of thinking about it. If I write a book about inheritance law and say ‘it is a clarification of the law’- then the ‘law’ in the sentence is known to be about inheritance law by context. So when the Quran says it is a clarification or a detailed explanation if ‘the law’ it is in a city text. Eg the deep explanation is to do with talaq and wirasat for example