Cryptic crossword clue
As Turing deciphered Enigma, initially used to identify someone 9

The most common and most likely answer to this crossword clue is the 9 letter word SIGNATURE

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

The straight part
We know that "used to identify someone" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case used to identify someone = signature.
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 SIGNATURE mean?

SIGNATURE noun
  1. A person's name, written by that person, used as identification or to signify approval of accompanying material, such as a legal contract.
  2. An act of signing one's name; an act of producing a signature.
  3. The part of a doctor’s prescription containing directions for the patient.
  4. Signs on the stave indicating key and tempo, composed of the key signature and the time signature.
  5. A group of four (or a multiple of four) sheets printed such that, when folded, they become a section of a book.
  6. A pattern used for matching the identity of a virus, the parameter types of a method, etc.
  7. Data attached to a message that guarantees that the message originated from its claimed source.
  8. A mark or sign of implication.
  9. A dish that is characteristic of a particular chef.
  10. A tuple specifying the sign of coefficients in any diagonal form of a quadratic form.
  11. A resemblance between the external character of a disease and those of some physical agent, for instance, that existing between the red skin of scarlet fever and a red cloth; supposed to indicate this agent in the treatment of the disease.
  12. Text (or images, etc.) appended to a user's emails, newsgroup posts, forum posts, etc. as a way of adding a personal touch. Email signatures often include extended contact information. Forum signatures often serve as a way for a user to express themselves (song lyrics, art, etc.).
SIGNATURE adjective
  1. Distinctive, characteristic, indicative of identity.

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