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

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 ENLISTING mean?
ENLISTING verb- To enter on a list; to enroll; to register.
- To join a cause or organization, especially military service.
- To recruit the aid or membership of others.
- To secure; to obtain.