Kindly or non-malignant (6)
I believe the answer is:
benign
This clue is a double definition.
'kindly' is the first definition.
(I've seen this before)
'non-malignant' is the second definition.
(I've seen this before)
(Other definitions for benign that I've seen before include "Genial, kindly" , "Kindly; not harmful" , "Salubrious" , "Meaning no harm" , "Harmless or kind" .)