Cryptic crossword clue
Computer image manipulation represented by gray heptagons 13

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

I've seen this crossword clue in Independent
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Buddy explains!

The straight part
We know that "Computer image manipulation" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case computer image manipulation = steganography.
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 STEGANOGRAPHY mean?

STEGANOGRAPHY noun
  1. The practice of hiding messages, so that the presence of the message itself is hidden, often by writing them in places where they may not be found until someone finds the secret message in whatever is being used to hide it.
  2. Specifically: the use of small computer files to communicate secret information.

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