The most common and most likely answer to this crossword clue is the 9 letter word LUMINESCE
I've seen this crossword clue in The Times
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More clues leading to the result LUMINESCE
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The straight part
We know that "shed light" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case shed light = luminesce.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 LUMINESCE mean?
LUMINESCE verb- To give off light, including in the invisible electromagnetic radiation frequencies, or become luminescent.