The phrase "normal clear system" can be described using a variety of synonyms depending on the context. For example, synonyms for "normal" include typical, standard, regular, and average. Similarly, "clear" can be replaced with unobstructed, transparent, or flawless. "System" can also be described using synonyms such as structure, mechanism, framework, or organization.
Overall, it's important to carefully consider the context in which the term is being used to determine the most appropriate synonym. In the medical field, for example, "normal clear system" might refer to a healthy patient with no signs of disease or infection, while in a technology context it might refer to a computer or software program functioning flawlessly.