This term is an idiom, which means that it is a phrase or expression that has a figurative meaning. The crossword solutions for this term are 'EXAM', which is a 4-letter word. The phrase '___ IS A TEST' can be interpreted to mean that something is being used as a way to measure or evaluate someone or something. This phrase is often used in educational contexts, such as when students take exams to demonstrate their knowledge and understanding of a subject. It can also be used in other contexts, such as when employers use tests to evaluate job applicants.