The crossword solution for the term 'Piece of Scum' is ALGA, which stands for aquatic plant life. Algae are a type of organism that can range from single-celled organisms to complex multicellular forms. They are found in both freshwater and marine environments, and they play an important role in the global carbon cycle. Algae are also used in many industries, such as food production, pharmaceuticals, and bioremediation.