Crossword Genius

Fool is amusing or ridiculous (9)

Ross

I believe the answer is:

ignoramus

'fool' is the definition.
(thesaurus)

'amusing or ridiculous' is the wordplay.
'ridiculous' indicates anagramming the letters.
'amusing'+'or'='amusingor'
'amusingor' with letters rearranged gives 'IGNORAMUS'.

'is' acts as a link.

(Other definitions for ignoramus that I've seen before include "One could be blissful it's said" , "Uninformed sort" , "One is not intelligent" , "Stupid person" , "Fool" .)

I've seen this clue in The Telegraph.
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