The crossword solution for the term 'LAW's Partner' is 'ORDER', which has five letters. ORDER is a concept that is closely related to LAW, as it is the principle of organization and structure that LAW is based on. ORDER is also often used in legal contexts, such as when referring to the ORDER of a court or the ORDER of a judge. In this way, ORDER is an essential partner to LAW, as it provides the framework for LAW to exist and be enforced.