### Clue: Live! Hit performer's jazz instrumentalist (8)
### Answer: BEBOPPER 
 ### Explanation: Definition: jazz instrumentalist
 BE(to live/to exist) + BOP(to hit/to punch quickly) + PER(abbrev. for "performer" ? or "personnel"/one who performs activities).
Defn: Instrumentalist playing bebop, a type of jazz characterised by complex harmony and rhythms.