The term SET A COURSE is composed of two crossword solutions, LED (3 letters) and DIRECTONESSTEPS (15 letters). LED stands for Light Emitting Diode, which is a type of semiconductor device that emits light when an electric current passes through it. DIRECTONESSTEPS is an idiom meaning to take control and set a plan of action. Together, the phrase SET A COURSE suggests taking control and setting a plan of action in order to achieve a goal.