The term 'PART OF A JAZZ COMBO' can be broken down into three crossword solutions: BASS (4 letters), SAX (3 letters), and ALTOSAX (7 letters). BASS is a stringed instrument that is typically used to provide the low-pitched rhythmic accompaniment in jazz music. SAX is a type of woodwind instrument, most commonly associated with jazz music, that produces a warm, mellow sound. ALTOSAX is a variation of the saxophone that is pitched one octave lower than the regular saxophone. All three instruments are essential components of a jazz combo, providing the melodic and rhythmic foundation for the ensemble.