The term 'PLASTIC CLUE WEAPON' can be solved by the four-letter word 'ROPE'. ROPE is a type of cord or string made from fibers such as hemp, jute, manila, or synthetic materials like nylon and polypropylene. It has been used for centuries for a variety of purposes, including fishing, sailing, and construction. In recent years, ROPE has become a popular tool for self-defense, as it can be used to restrain an attacker or to create a makeshift weapon. Plastic ROPE is often used in this context, as it is lightweight and durable.