Being a fool I do it wrongly (5)
I believe the answer is:
idiot
'being a fool' is the definition.
(I've seen this before)
'i do it wrongly' is the wordplay.
'wrongly' indicates anagramming the letters.
'do'+'it'='doit'
'doit' is an anagram of 'diot'.
'i'+'diot'='IDIOT'
(Other definitions for idiot that I've seen before include "eg Dostoevski's Myshkin" , "Dunce" , "Ass, ninny" , "Moron, fool" , "Silly person or dimwit" .)