"It's hard to be humble when you're as great as I am” speaker (3)
I believe the answer is:
ali
'it's hard to be humble when you're as great as i am speaker' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ali that I've seen before include "Muhammad - - , legendary boxer" , "Dickens novel" , "Former boxing champion" , "Son-in-law to Muhammad" , "Muhammad ... (former fighter)" .)