The crossword solution for the term 'Trumpet Holder' is 'CASE, ' which is a four-letter word. A trumpet CASE is a protective covering for a trumpet, typically made of hard plastic or wood. It is designed to protect the instrument from damage and keep it safe during transport. The CASE also helps to keep the trumpet in tune and prevent it from becoming damaged by moisture. Trumpet cases come in a variety of sizes and styles, depending on the type of trumpet being used.