Crossword Genius

He knows nothing amusing or out of place (9)

Ross

I believe the answer is:

ignoramus

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'he knows nothing' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'amusing or out of place' is the wordplay.
'out of place' indicates an anagram.
'amusing'+'or'='amusingor'
'amusingor' anagrammed gives 'IGNORAMUS'.

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(Other definitions for ignoramus that I've seen before include "One who knows nothing" , "unwitting person" , "Idiot" , "Simpleton" , "one in a state of bliss?" .)

I've seen this clue in The Globe and Mail.
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