Nitwits (6)
I believe the answer is:
idiots
'nitwits' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for idiots that I've seen before include "imbeciles" , "Nincompoops" , "Fools, dimwits" , "Foolish people" , "Abusive word for unintelligent or irrational people" .)