The term 'PIANO FIXER' can be broken down into two words: 'PIANO' and 'FIXER'. The job of a PIANO FIXER is to repair, maintain, and tune pianos. The crossword solution for the term 'PIANO FIXER' is 'TUNER', which refers to someone who tunes pianos. Tuning a PIANO involves adjusting the strings and other components to ensure that the instrument produces the correct pitch and sound. A PIANO FIXER may also be responsible for repairing any damage to the instrument, such as replacing broken strings or fixing broken keys.