The crossword solution for the term 'ONE OF TWO IN A CRASH' is 'CYMBAL', which is a six-letter word. Cymbals are percussion instruments consisting of two metal plates that are struck together to create a loud, ringing sound. They are commonly used in orchestras, marching bands, and other musical ensembles. In this context, the term 'one of two in a crash' could refer to the sound of two cymbals crashing together.