The most common and most likely answer to this crossword clue is the 13 letter word SCINTILLATING
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More clues leading to the result SCINTILLATING
Buddy explains!

The straight part
We know that "Dazzling" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case dazzling = scintillating.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 SCINTILLATING mean?
SCINTILLATING verb- To give off sparks; to shine as if emanating sparks; to twinkle or glow.
- To throw off like sparks.
- That scintillates with brief flashes of light; sparkling.
- Brilliantly or impressively clever, exciting, amusing or witty.