Cryptic crossword clue
Old version of The Mirror put on electronic viewing device

The most common and most likely answer to this crossword clue is the 8 letter word EYEGLASS

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

The straight part
We know that "viewing device" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case viewing device = eyeglass.
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 EYEGLASS mean?

EYEGLASS noun
  1. An artificial lens, especially one of a pair.
  2. A monocle.
  3. An eyepiece.
  4. The lens of the eye.

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