The term 'restless urge' can be summarized by the crossword solution of 'ITCH'. An ITCH is an uncomfortable sensation on the skin that causes a person to want to scratch it. It is often caused by irritation or inflammation of the skin, and can be caused by a variety of things such as allergies, insect bites, and skin conditions. Itching can also be a symptom of certain medical conditions, such as kidney disease or liver disease.