Crossword Genius

Amusing or silly fool (9)

Ross

I believe the answer is:

ignoramus

'fool' is the definition.
(thesaurus)

'amusing or silly' is the wordplay.
'silly' indicates an anagram.
'amusing'+'or'='amusingor'
'amusingor' with letters rearranged gives 'IGNORAMUS'.

(Other definitions for ignoramus that I've seen before include "Dunce" , "Dimwit" , "Uninformed sort" , "One who knows nothing" , "unwitting person" .)

I've seen this clue in The Times.
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