The most common and most likely answer to this crossword clue is the 10 letter word TRANSPIRED
I've seen this crossword clue in Independent
T
R
A
N
S
P
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R
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D
Buddy explains!

The straight part
We know that "came to light" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case came to light = transpired.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 TRANSPIRED mean?
TRANSPIRED verb- To give off (vapour, waste matter etc.); to exhale (an odour etc.).
- To perspire.
- Of plants, to give off water and waste products through the stomata.
- To become known; to escape from secrecy.
- To happen, take place.