### Clue: Acrobat bum-over-hip in roll (12)
### Answer: TRAMPOLINIST 
 ### Explanation: Definition: Acrobat
 TRAMP(a bum/a vagrant) + O(abbrev. for "over" in cricket scores) + [ IN(hip/up-to-date with fashion) **contained in**(in) LIST(a roll/a register of names) ].