The crossword solutions for the term FUSS, DIFFICULTY are ADO, which stands for 'A Drop of'. This is a phrase used to describe a small amount of something, usually a liquid. It is often used in the context of cooking or baking, where a small amount of an ingredient can make a big difference in the outcome of the dish. In this context, it can be used to describe the difficulty of a task, as a small mistake can cause a lot of fuss and difficulty.