Exam scheduled before midday? That's not ethical (6)
I believe the answer is:
amoral
'that's not ethical' is the definition.
(I've seen this before)
'exam scheduled before' is the wordplay.
'exam' becomes 'oral' (oral exam is a kind of exam).
'scheduled' becomes 'am' (I can't justify this - if you can you should believe this answer much more).
'before' is a charade indicator (letters next to each other).
'oral' after 'am' is 'AMORAL'.
'midday?' acts as a link.
This may not be right. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for amoral that I've seen before include "Having no standards of right or wrong" , "regardless of what's right or wrong" , "Having no code of ethics" , "Lacking any ethical standards" , "Shameless" .)