I find plenty wrong stupidly (7)
I believe the answer is:
ineptly
'stupidly' is the definition.
'i find plenty wrong' is the wordplay.
'find' is a charade indicator (letters next to each other).
'wrong' indicates anagramming the letters.
'plenty' with letters rearranged gives 'neptly'.
'i'+'neptly'='INEPTLY'
(Other definitions for ineptly that I've seen before include "In an incompetent manner" , "In a maladroit manner" , "Awkwardly, clumsily" , "without finesse" .)