Cryptic crossword clue
Impressing with security feature of note 12

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

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

The straight part
We know that "Impressing with security feature of note" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case impressing with security feature of note = watermarking.
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 WATERMARKING mean?

WATERMARKING verb
  1. To mark paper with a watermark.
  2. To mark a datafile with a digital watermark.

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