Cryptic crossword clue
Sanction naughty boy, lip given a brief curl 10

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

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

The straight part
We know that "Sanction" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sanction = imprimatur.
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 IMPRIMATUR mean?

IMPRIMATUR noun
  1. An official license to publish or print something, especially when censorship applies.
  2. (by extension) Any mark of official approval.

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