Cryptic crossword clue
Nasty spy Carl and I work in code-breaking 13

The most common and most likely answer to this crossword clue is the 13 letter word CRYPTANALYSIS

I've seen this crossword clue in Financial Times
C
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More clues leading to the result CRYPTANALYSIS

Buddy explains!

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 CRYPTANALYSIS mean?

CRYPTANALYSIS noun
  1. The science of analyzing and breaking of codes and ciphers.
  2. An analysis or decrypting of a specific text or a specific code or cipher.

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