Idiocy (9)

I think it could be either:

Which length description are you looking for?:

stupidity

'idiocy' is the definition.
(thesaurus)

This is the entire clue.

(Other definitions for stupidity that I've seen before include "Lack of intelligence" , "Folly" , "Dull-wittedness" .)

I've seen this clue in the Sydney Morning Herald.

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