The term 'Painting Supply' can be summarized by the solution to the crossword clue 'ROLLER' which is a six letter word. A ROLLER is a tool used in painting, typically consisting of a cylinder covered with fabric or foam that is used to apply paint to a surface. Rollers are often used to quickly and evenly cover large areas with paint, such as walls and ceilings. They are also used to create textures and patterns on surfaces.