The most common and most likely answer to this crossword clue is the 6 letter word SEQUIN
I've seen this crossword clue in Financial Times
S
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Q
U
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N
More clues leading to the result SEQUIN
- One that shines as member of large Kent family?
- Something shiny and small, associated with horses mostly
- Adornment of one of five Kent children?
- Briefly spot one of five siblings, bright little thing
- Decorative item shown by second horse without a tail
- Sparkler in use when it’s lit
- Endless quest organised at home for sparkly thing
- One of five children from the south-east? Sparkly little thing
- Unusual question — not to one that sparkles?
- Glittery item is largely typical of runner?
Buddy explains!

The straight part
We know that "bright little thing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bright little thing = sequin.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 SEQUIN mean?
SEQUIN noun- Any of various small gold coins minted in Italy and Turkey.
- A sparkling spangle used for the decoration of ornate clothing.