Morning viva voce is quite unethical (6)
I believe the answer is:
amoral
'quite unethical' is the definition.
'amoral' can be an answer for 'unethical' (I've seen this before). I'm not certain of the 'quite' bit.
'morning viva voce' is the wordplay.
'morning' becomes 'am' (as in 12:00 AM).
'viva voce' becomes 'oral' (synonyms).
'am'+'oral'='AMORAL'
'is' is the link.
Can you help me to learn more?
(Other definitions for amoral that I've seen before include "Unconcerned with correctness" , "Unconcerned about what's right or wrong" , "Unaffected by any sense of right and wrong" , "without guiding principles" , "Unprincipled" .)