Composed some classical music (4)
I believe the answer is:
calm
'composed' is the definition.
(similar in meaning)
'some classical music' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'CALM' is hidden within 'classical music'.
(Other definitions for calm that I've seen before include "Composed or free from storms" , "Tranquil, undisturbed" , "Still and quiet" , "Still - force 0 on the Beaufort scale" , "Placid, unexcited" .)