Lacking any ethical sense (6)
I believe the answer is:
amoral
'lacking any ethical sense' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for amoral that I've seen before include "Blind to right and wrong" , "Not knowing right or wrong" , "outrageous!" , "Unscrupulous" , "Unconcerned with correctness" .)