The most common and most likely answer to this crossword clue is the 9 letter word ENSHRINES
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More clues leading to the result ENSHRINES
Buddy explains!

The straight part
We know that "Protects" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case protects = enshrines.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 ENSHRINES mean?
ENSHRINES verb- To enclose (a sacred relic etc.) in a shrine or chest.
- To preserve or cherish (something) as though in a shrine; to preserve or contain, especially with some reverence.
- To protect an idea, ideal, or philosophy within an official law or treaty