Cryptic crossword clue
Secrecy measure unknown in Princeton, strangely 10

The most common and most likely answer to this crossword clue is the 10 letter word ENCRYPTION

I've seen this crossword clue in The Guardian
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Buddy explains!

The straight part
We know that "Secrecy measure" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case secrecy measure = encryption.
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 ENCRYPTION mean?

ENCRYPTION noun
  1. The process of obscuring information to make it unreadable without special knowledge, key files, or passwords.
  2. A ciphertext, a cryptogram, an encrypted value. Usually used with the preposition "of" followed by the value that is hidden in it.

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