Notice wickedness of counsel (6)
I believe the answer is:
advice
'counsel' is the definition.
(I've seen this before)
'notice wickedness' is the wordplay.
'notice' becomes 'ad' (short for advert).
'wickedness' becomes 'vice' (I've seen this in another clue).
'ad'+'vice'='ADVICE'
'of' is the link.
(Other definitions for advice that I've seen before include "Warning - guidance" , "Counsel given" , "'Counsel, guidance (6)'" , "Informed counsel" , "Supposedly wise words" .)