Start to make music with some women (4)
I believe the answer is:
open
'start' is the definition.
(opening is a kind of starting)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for open that I've seen before include "Exposed to the air" , "Widely known" , "hardly high-security" , "Freely accessible" , "Unrestricted; ready for business" .)