Help notice immorality (6)
I believe the answer is:
advice
'help' is the definition.
'notice immorality' is the wordplay.
'notice' becomes 'ad'.
'immorality' becomes 'vice' (vice is a kind of immorality).
'ad'+'vice'='ADVICE'
(Other definitions for advice that I've seen before include "What lawyer offers" , "tip" , "'Counsel, guidance (6)'" , "Supposedly wise words" , "Suggestion for appropriate course of action" .)