Denebola's constellation (3)
I believe the answer is:
leo
'denebola's constellation' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for leo that I've seen before include "Horoscope sign" , "sign of summer" , "Singer-songwriter Sayer, b. 1949" , "Fifth sign of the zodiac" , "Star sign of one born on August 1" .)