"Sorrow indeed!" said old philosopher (8)
I believe the answer is:
rousseau
'philosopher' is the definition.
(I know that Rousseau is a philosopher)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for rousseau that I've seen before include "Is Esau sour about the Swiss philosopher?" , "Painter, Henri - philosopher, Jean Jacques" , "Arouse us like Jean-Jacques . . . . . . . ., philosopher" , "Henri -, French painter aka Le Douanier" , "Impressionist" .)