Cryptic crossword clue
Engineers taking part in light diversion 10

The most common and most likely answer to this crossword clue is the 10 letter word REFRACTION

I've seen this crossword clue in The Daily Telegraph
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Buddy explains!

The straight part
We know that "light diversion" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case light diversion = refraction.
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 REFRACTION mean?

REFRACTION noun
  1. The turning or bending of any wave, such as a light or sound wave, when it passes from one medium into another of different optical density.
  2. The degree to which a metal or compound can withstand heat

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