Cryptic crossword clue
Proof from new violin data

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

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

The straight part
We know that "Proof" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case proof = validation.
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 VALIDATION mean?

VALIDATION noun
  1. The act of validating something.
  2. Something, such as a certificate, that validates something; attestation, authentication, confirmation, proof or verification.
  3. The process whereby others confirm the validity of one's emotions.
  4. The process of identifying a new prisoner's gang affiliation.

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