Quiet, soothing (7)
I believe the answer is:
restful
This clue is a double definition.
'quiet' is the first definition.
(similar in meaning)
'soothing' is the second definition.
(synonyms)
(Other definitions for restful that I've seen before include "Still - calming" , "Sedative" , "Calm" , "Relaxing" , "Soothing is required" .)