Misty not covered by chamber musician (7)
I believe the answer is:
cellist
'misty not covered by chamber musician' is the definition.
'cellist' can be an answer for 'musician' (cellist is a kind of musician). I am unsure of the 'misty not covered by chamber' bit.
'chamber musician' is the wordplay.
'chamber' becomes 'cell' (I've seen this before).
'musician' becomes 'ist' (I can't justify this - if you can you should give a lot more credence to this answer).
'cell'+'ist'='CELLIST'
Can you help me to learn more?
(Other definitions for cellist that I've seen before include "E.g. Casals, du Pre" , "Du Pre or Lloyd Weber" , "Lloyd Webber?" , "Musician in string section" , "String player" .)