Cryptic crossword clue
A cracking job! 12

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

I've seen this crossword clue in The Daily Telegraph
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More clues leading to the result CRYPTOGRAPHY

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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.

Crossword Answer definitions

CRYPTOGRAPHY noun
  1. The discipline concerned with communication security (eg, confidentiality of messages, integrity of messages, sender authentication, non-repudiation of messages, and many other related issues), regardless of the used medium such as pencil and paper or computers.

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