Notice bad habit in counselling (6)
I believe the answer is:
advice
'counselling' is the definition.
(I've seen this before)
'notice bad habit' is the wordplay.
'notice' becomes 'ad' (short for advert).
'bad habit' becomes 'vice' (a sin or weakness).
'ad'+'vice'='ADVICE'
'in' is the link.
(Other definitions for advice that I've seen before include "Proposal for an appropriate course of action" , "Opinion offered as to future action" , "Opinion given about what to do" , "Supposedly wise words" , "Warning - guidance" .)