Wrong grade for Mr Poe? (5)

I believe the answer is:

edgar

I'm a little stuck... Click here to teach me more about this clue!

'mr poe?' is the definition.
'edgar' can be an answer for 'poe?' (I've seen this in another clue). I'm not certain of the 'mr' bit.

'wrong grade' is the wordplay.
'wrong' indicates an anagram.
'grade' anagrammed gives 'EDGAR'.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for edgar that I've seen before include "10th-cent. English king" , "Fellow" , "J. -- Hoover, FBI boss" , "- Wallace, Eng. thriller writer" , "- Rice Burroughs, US novelist" .)

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