Crossword Genius

I do it badly, in charge, being foolish (7)

Ross

I believe the answer is:

idiotic

'foolish' is the definition.
(I've seen this before)

'i do it badly in charge' is the wordplay.
'badly' indicates anagramming the letters (letters in the wrong order).
'in charge' becomes 'ic' (abbreviation for 'in charge').
'do'+'it'='doit'
'doit' is an anagram of 'diot'.
'i'+'diot'+'ic'='IDIOTIC'

'being' is the link.

(Other definitions for idiotic that I've seen before include "Daft" , "description of Dostoevsky hero?" , "Altogether nonsensical" , "Fatuous" , "Stupid, foolish" .)

I've seen this clue in The Telegraph.
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