Unforced musical note (7)
I believe the answer is:
natural
I believe this clue is a double definition.
'unforced' is the first definition.
(I've seen this before)
'musical note' is the second definition.
(thesaurus)
(Other definitions for natural that I've seen before include "Unsophisticated" , "Additive-free" , "(Of fabric) off-white" , "sort of history" , "Unaffected; off-white" .)