The most common and most likely answer to this crossword clue is the 9 letter word INITIATES
I've seen this crossword clue in The Times
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More clues leading to the result INITIATES
Buddy explains!

The straight part
We know that "New members" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case new members = initiates.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does INITIATES mean?
INITIATES noun- A new member of an organization.
- One who has been through a ceremony of initiation.
- To begin; to start.
- To instruct in the rudiments or principles; to introduce.
- To confer membership on; especially, to admit to a secret order with mysterious rites or ceremonies.
- To do the first act; to perform the first rite; to take the initiative.