Counsel modern wickedness (6)
I believe the answer is:
advice
'counsel' is the definition.
(I've seen this before)
'modern wickedness' is the wordplay.
'modern' becomes 'ad' (I've seen this in other clues).
'wickedness' becomes 'vice' (I've seen this in another clue).
'ad'+'vice'='ADVICE'
(Other definitions for advice that I've seen before include "Opinion given about what to do" , "Proposal for an appropriate course of action" , "Counselling" , "Recommendation for a course of action" , "Warning - guidance" .)