### Clue: Buzz Lightyear's back, ready to entertain (5)
### Answer: DRONE 
 ### Explanation: Definition: Buzz
 **Last letter of**(…'s back) "Lightyear" **contained in**(… to entertain) DONE(ready/suitable and available for immediate use, as in "the turkeys done").
Defn: A low continuous humming sound.