The term 'ORCHESTRA clasher' is composed of two words: 'ORCHESTRA' and 'clasher'. The first word, 'ORCHESTRA', refers to a large group of musicians who play together in an ensemble. The second word, 'clasher', refers to a loud, crashing sound. Together, the term 'ORCHESTRA clasher' refers to a percussion instrument that produces a loud, crashing sound when struck, such as a cymbal. The crossword solution for this term is 'cymbal', which is a type of percussion instrument consisting of a thin metal disc that produces a loud, ringing sound when struck.