Crossword Genius

Amusing or otherwise, he has a lot to learn (9)

Ross

I believe the answer is:

ignoramus

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'he has a lot to learn' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'amusing or otherwise' is the wordplay.
'otherwise' indicates anagramming the letters.
'amusing'+'or'='amusingor'
'amusingor' is an anagram of 'IGNORAMUS'.

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(Other definitions for ignoramus that I've seen before include "Ron is a mug (anag.)" , "Dimwit" , "One who knows nothing" , "One could be blissful it's said" , "Uninformed sort" .)

I've seen this clue in the Evening Standard.
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