### Clue: Cut singers from ensemble – allocation not working (8)
### Answer: CASTRATI 
 ### Explanation: Definition: Cut singers
 CAST(an ensemble;a group of musicians, actors or dancers performing together) + "ration"(allocation of a limited amount of stuff) **minus**(not) "on"(working, as with an electrical appliance).
Defn: Guess what has been cut from these male adult singers for them to retain their soprano or alto voices?