RING OUT (6 letters) The term 'Sound Trolley' is a combination of two crossword solutions: CLANG (5 letters) and RING OUT (6 letters). CLANG is a sound that is made when two metal objects are struck together, while RING OUT is an expression used to describe the sound of a bell or other object ringing loudly. Together, these two words form the term 'Sound Trolley', which is used to describe a vehicle that makes a loud noise as it moves along its route.