Killing without malice (12)
I believe the answer is:
manslaughter
'killing without malice' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for manslaughter that I've seen before include "Crime of unpremeditated killing" , "Killing without malice" , "charge?" , "Crime of killing, short of murder" , "Unlawful killing" .)