Notice immorality at the bottom of our modern age (6)
I believe the answer is:
advice
'notice' is the definition.
(I have seen 'Formal notice' mean 'advice' so perhaps 'notice' could also mean 'advice')
'immorality at the bottom of our modern age' is the wordplay.
I cannot really understand how this works, but
'immorality' could be 'vice' (vice can mean immoral behaviour) and 'vice' is present in the answer.
'modern' could be 'ad' (I've seen this in other clues) and 'ad' is found in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for advice that I've seen before include "Guidance; delivery note" , "Recommendation for a course of action" , "Counsel given" , "Admonition" , "tip" .)