The first voice heard in "The Wizard of Oz" (3)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
leo
(Other definitions for leo that I've seen before include "of pride" , "Horoscope sign" , "MGM's lion" , "Singer-songwriter Sayer, b. 1949" , "Star sign of one born on August 1" .)