Cryptic crossword clue
Mark secures one’s address formally 12

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

I've seen this crossword clue in Financial Times
A
P
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Buddy explains!

The straight part
We know that "address formally" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case address formally = apostrophise.
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 APOSTROPHISE mean?

APOSTROPHISE verb
  1. To address using the form of rhetoric called the apostrophe.
  2. To add one or more apostrophe characters to text to indicate missing letters.

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