Cryptic crossword clue
Like pupil, say, first among ten struggling, I see 8

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

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The straight part
We know that "Like pupil, say" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case like pupil, say = entoptic.
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 ENTOPTIC mean?

ENTOPTIC adjective
  1. Located within the eyeball.
  2. Of or relating to visual phenomena caused by objects within the eye, or the objects themselves.

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