Fierce and courageous sign (3)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
leo
(Other definitions for leo that I've seen before include "Singer-songwriter Sayer, b. 1949" , "Zodiacal lion" , "Star sign of one born on August 1" , "one of several popes" , "born in July or August" .)