Idiocy (9)

I think it could be either:

Which length description are you looking for?:

inanity

'idiocy' is the definition.
(thesaurus)

This is all the clue.

(Other definitions for inanity that I've seen before include "Mindlessness" , "Being silly" , "Folly" , "Senselessness - frivolous utterance" , "Foolishness" .)

I've seen this clue in The Sun.

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