To date, ethics classes show little for those making incision (5)
I believe the answer is:
teeth
'little for those making incision' is the definition.
I can't tell whether this defines the answer.
'to date ethics classes' is the wordplay.
'TEETH' is hidden within the letters.
However, I'm unsure how this is indicated.
'show' acts as a link.
Can you help me to learn more?
(Other definitions for teeth that I've seen before include "Effective powers" , "Being in your face" , "Canines, for example" , "Incisors, say" , "Choppers" .)