Schopenhauer called him a "clumsy charlatan" (5)
I believe the answer is:
hegel
'schopenhauer called him a clumsy charlatan' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for hegel that I've seen before include "German 'dialectic' philosopher" , "Georg Wilhelm ---, Ger. philosopher" , "German philosopher, d. 1831" .)