The artist is up late for breakfast (5)
I believe the answer is:
manet
'the artist' is the definition.
(I've seen this before)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for manet that I've seen before include "Edouard ___, painted Dejeuner sur l'herbe, d. 1883" , "Edouard ---, pre-impressionist" , "French painter" , "artistic individual" , "Edouard - - (painter)" .)