Professional misconduct involved clear impact (11)
I believe the answer is:
malpractice
'professional misconduct' is the definition.
(I've seen this before)
'involved clear impact' is the wordplay.
'involved' indicates an anagram (involved can mean confusing or complex).
'clear'+'impact'='clearimpact'
'clearimpact' with letters rearranged gives 'MALPRACTICE'.
(Other definitions for malpractice that I've seen before include "Improper professional behaviour" , "abuse" , "Professional misconduct" , "Professional wrongdoing" , "unprofessionalism" .)