MGM lion (3)
I believe the answer is:
leo
'mgm lion' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for leo that I've seen before include "Singer-songwriter Sayer, b. 1949" , "Pope" , "born in July or August" , "sign of summer" , "5th sign of the zodiac" .)