Cryptic crossword clue
They look into wrong mark given to swimmers 1-4

The most common and most likely answer to this crossword clue is the 6 letter word X-RAYS

I've seen this crossword clue in The Guardian
X
-
R
A
Y
S

Buddy explains!

The straight part
We know that "They look into" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case they look into = x-rays.
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 X-RAYS mean?

X-RAYS noun
  1. Short wavelength electromagnetic radiation usually produced by bombarding a metal target in a vacuum. Used to create images of the internal structure of objects; this is possible because X-rays pass through most objects and can expose photographic film.
  2. A radiograph: a photograph made with X-rays.
  3. An X-ray machine.
  4. The letter X in the ICAO spelling alphabet.

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