Graduate turned up before exam, perfectly happy to cheat? (6)
I believe the answer is:
amoral
'perfectly happy to cheat?' is the definition.
(cheating is immoral or amoral)
'graduate turned up before exam' is the wordplay.
'graduate' becomes 'ma' (abbreviation for Master of Arts).
'turned up' is a reversal indicator.
'before' says to put letters next to each other.
'exam' becomes 'oral' (spoken academic test).
'ma' written backwards gives 'am'.
'am'+'oral'='AMORAL'
(Other definitions for amoral that I've seen before include "Unaffected by any sense of right and wrong" , "Having no code of ethics" , "Not knowing right or wrong" , "Without moral standards or principles" , "Unconcerned about what's right or wrong" .)