The most common and most likely answer to this crossword clue is the 7 letter word SCANNER
I've seen this crossword clue in Independent
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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 SCANNER mean?
SCANNER noun- A device which scans documents in order to convert them to a digital medium.
- A radio receiver which iterates through a sequence of frequencies to detect signal.
- A device which uses radiation (ultrasound, X-ray, etc.) to generate images of tissue or surfaces for diagnostic purposes.
- A device which uses optics to detect printed data (such as a barcode).
- One who scans.