Given the wrong grade, he raged wildly (5)

I believe the answer is:

edgar

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'given the wrong grade he' is the definition.
The definition suggests a singular noun which matches the answer.

'raged wildly' is the wordplay.
'wildly' indicates anagramming the letters.
'raged' with letters rearranged gives 'EDGAR'.

Can you help me to learn more?

(Other definitions for edgar that I've seen before include "J. -- Hoover, FBI boss" , "10th-cent. English king" , "Grade (anag)" , "- Rice Burroughs, US novelist" , ". . . . . Allan Poe, master of the macabre" .)

I've seen this clue in the Evening Standard.

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