He raged madly (5)
I believe the answer is:
edgar
'he' is the definition.
'raged madly' is the wordplay.
'madly' indicates an anagram.
'raged' with letters rearranged gives 'EDGAR'.
(Other definitions for edgar that I've seen before include "- Wallace, Eng. thriller writer" , "King of England" , "- Rice Burroughs, US novelist" , "10th-cent. English king" , "- Allan Poe, US writer" .)