Mild or kindly (6)
I believe the answer is:
gentle
I believe this is a double definition.
'mild' is the first definition.
(similar in meaning)
'kindly' is the second definition.
(I've seen this in another clue)
(Other definitions for gentle that I've seen before include "Moderate, quiet; a maggot" , "Mild, kind, tender" , "Mild; a maggot" , "Moderate in effect" , "'Do not go ... into that good night'/Thomas" .)