Musicians send raunchy message containing note (6)
I believe the answer is:
sextet
'musicians' is the definition.
(a sextet is a group of six musicians)
'message containing note' is the wordplay.
'message' becomes 'sext' (I have seen 'Explicit message' mean 'sext' so perhaps 'message' could also mean 'sext').
'containing' is an insertion indicator.
'note' becomes 'te' (musical note as in do re mi fa so la ti).
'sext' enclosing 'te' is 'SEXTET'.
'send raunchy' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for sextet that I've seen before include "Chamber group (1)" , "Group of six players" , "Musical work" , "Music for six" , "Half-dozen in a group" .)