Benign, innocuous (8)
I believe the answer is:
harmless
This clue is a double definition.
'benign' is the first definition.
(similar in meaning)
'innocuous' is the second definition.
(synonyms)
(Other definitions for harmless that I've seen before include "Causing no damage" , "Completely safe" , "Not injurious" , "Safe; innocent" , "Not posing any danger" .)