The most common and most likely answer to this crossword clue is the 8 letter word SPARKLER
S
P
A
R
K
L
E
R
More clues leading to the result SPARKLER
- Flashy gem that gets waved around when guy’s on fire?
- Brilliant odds before racehorse runs
- Rep larks around, displaying firework
- Diamond in box king left queen
- Jewel box presented by King Lear, Cordelia ultimately rejected
- Second pen containing large stone
- Malaysian capital invested in less rounded gem
- Firework, a gem
- Odds on famous racehorse first to run? It might be seen in November
- Jewel box king’s given upstart relative, in short
Buddy explains!

The straight part
We know that "Jewel" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case jewel = sparkler.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 SPARKLER mean?
SPARKLER noun- A hand-held firework that emits sparks.
- A gem or ornament that sparkles.
- A vivacious and charismatic person.
- A sparkling wine.
- A tiger beetle.
- One who scatters; especially, one who scatters money; an improvident person.