Cryptic crossword clue
Extremely tough card device which puts things through eyes 8

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

T
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E
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Buddy explains!

The straight part
We know that "which puts things through eyes" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case which puts things through eyes = threader.
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 THREADER mean?

THREADER noun
  1. A device used to thread needles.
  2. A device used to machine a screw thread.

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