The term ATTACH, AS TO A LAPEL can be summarized by the crossword solution PINON, which is a five-letter word. Pinon is a type of pine tree native to the southwestern United States and Mexico. The pinon tree produces edible nuts that are often used in cooking. In addition, the needles of the pinon tree are sometimes used to make a type of jewelry known as a lapel pin. Thus, the term ATTACH, AS TO A LAPEL can be summarized by the crossword solution PINON, which refers to the act of attaching a lapel pin to clothing.