Idiotic lists we developed (7)
I believe the answer is:
witless
'idiotic' is the definition.
(thesaurus)
'lists we developed' is the wordplay.
'developed' indicates anagramming the letters.
'lists'+'we'='listswe'
'listswe' with letters rearranged gives 'WITLESS'.
(Other definitions for witless that I've seen before include "Foolish, stupid" , "Daft" , "Out of one's mind (maybe scared)" , "Lacking sense, understanding or judgment" .)