Artist who rose at ten AM (5)
I believe the answer is:
manet
'artist' is the definition.
(I've seen this before)
'rose at ten am' is the wordplay.
'rose' shows that the letters should be reversed in order.
'at' is a charade indicator (letters next to each other).
'ten'+'am' is 'tenam'.
'tenam' backwards is 'MANET'.
'who' is the link.
(Other definitions for manet that I've seen before include "artistic individual" , "Painter of Le Dejeuner sur l'herbe, d. 1883" , "French painter" , "Edouard ---, pre-impressionist" , "Edouard ___, painted Dejeuner sur l'herbe, d. 1883" .)