Francis had it for breakfast! (5)
I believe the answer is:
bacon
'francis' is the definition.
(I know that francis can be written as Bacon)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for bacon that I've seen before include "Painter; cured meat" , "English philosopher, d.1626 - Irish painter, d. 1992" , "Artist - meat" , "Man killed by chicken, some say" , "Thin slices of pig" .)