Cryptic crossword clue
Claim dire sin somehow should be made illegal 12

The most common and most likely answer to this crossword clue is the 12 letter word CRIMINALISED

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

The straight part
We know that "made illegal" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case made illegal = criminalised.
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 CRIMINALISED mean?

CRIMINALISED verb
  1. To make (something) a crime; to make illegal under criminal law; to ban.
  2. To treat as a criminal.

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