Wrote music, calm (8)
I believe the answer is:
composed
I believe this clue is a double definition.
'wrote music' is the first definition.
('compose' can be a synonym of 'write music')
'calm' is the second definition.
(similar in meaning)
(Other definitions for composed that I've seen before include "Calm; created music" , "wrote notes" , "Calm and collected" , "Settled" , "Written" .)