Notice wickedness of counsel (6)
'counsel' is the definition.
(I've seen this before)
'notice wickedness' is the wordplay.
'notice' becomes 'ad' (both can mean an advertisement).
'wickedness' becomes 'vice' (I've seen this before).
'of' acts as a link.
(Other definitions for advice that I've seen before include "tip", "Warning - guidance", "Formal notice", "Admonition", "Supposedly wise words".)