As a detective, I was immediately intrigued by the crossword clue ‘High grade‘. I started by thinking about the various grades that one can receive in school and wondered which one would be considered ‘high‘. My instinct told me that an A grade is typically considered the highest possible grade, so I decided to explore that avenue further. I considered the possibility that the answer could be a synonym or phrase that means ‘A grade‘, but nothing came to mind. Then, an idea struck me – the term ‘Aplus‘ is often used to describe something that is excellent or of the highest quality. It made perfect sense – an A grade is indeed the highest grade one can achieve, and ‘Aplus‘ is synonymous with excellence. My hunch paid off, and I confidently filled in the answer: APLUS. As a detective, it is always satisfying to crack a case, and this was no exception.