Not artificial note (7)
I believe the answer is:
natural
I believe this clue is a double definition.
'not artificial' is the first definition.
('natural' is the opposite to 'artificial')
'note' is the second definition.
(I've seen this before)
(Other definitions for natural that I've seen before include "Certainty" , "Unaffected - innate" , "lacking sophistication" , "Unaffected; unaltered" , "Organic" .)