Still involved in classical music (4)
I believe the answer is:
calm
'still' is the definition.
(I know that still can be written as calm)
'involved in classical music' is the wordplay.
'involved in' indicates a hidden word.
'CALM' is hidden in the letters of 'classical music'.
(Other definitions for calm that I've seen before include "Cool, composed" , "Composed or free from storms" , "Composed and collected" , "Windless" , "Self-possessed" .)