The most common and most likely answer to this crossword clue is the 9 letter word LAICISING
I've seen this crossword clue in Financial Times
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Buddy explains!

The straight part
We know that "Making public" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case making public = laicising.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 LAICISING mean?
LAICISING verb- To convert from church controlled to independent of the church; to secularize.
- To reduce from clergy to layman.
- To convert to lay status.