Cryptic crossword clue
Challenge over part of form I release to public 10

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

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

The straight part
We know that "release to public" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case release to public = declassify.
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 DECLASSIFY mean?

DECLASSIFY verb
  1. To remove the classification from; to lift the restrictions on

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