Cryptic crossword clue
Prince of darkness surrounded by fireflies' light due to this 9

The most common and most likely answer to this crossword clue is the 9 letter word LUCIFERIN

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Buddy explains!

The straight part
We know that "fireflies' light due to this" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fireflies' light due to this = luciferin.
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 LUCIFERIN mean?

LUCIFERIN noun
  1. Any of a class of polycyclic heterocycles that are responsible for the bioluminescence of fireflies, being converted to oxyluciferin by luciferase in the process.

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