Crossword Genius

Start to make music with some women (4)

Ross

I believe the answer is:

open

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'start' is the definition.
(opening is a kind of starting)

I don't understand the remainder of the clue.

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(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" .)

I've seen this clue in the Evening Standard.
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