Simpletons (5)

I think it could be either:

Which length description are you looking for?:

fools

'simpletons' is the definition.
(I know this)

This is all the clue.

(Other definitions for fools that I've seen before include "Proverbially, they rush in" , "'... rush in where angels fear to tread'" , "Twits; outwits" , "' - - Rush in', song" , "Deceives" .)

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

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