The crossword solution for the term 'knight supporter' is PIP, which stands for 'Page in Waiting'. A Page in Waiting is a young attendant who serves a knight or other noble person. They are usually between the ages of 8 and 14 and are responsible for tasks such as carrying messages, running errands, and attending to the knight's needs. Pages in Waiting are also expected to learn the knight's code of conduct and serve as an example to others.