The crossword solution for the term ONE FOR THE ROADIE is AMP, which stands for Amplifier. An amplifier is an electronic device used to increase the magnitude of a signal. It is commonly used in audio systems to increase the volume of sound. In the music industry, amplifiers are essential for live performances and recordings. The term 'One for the Roadie' is a phrase used to thank the roadie, or technician, who sets up and maintains the amplifiers and other equipment for a band.