The most common and most likely answer to this crossword clue is the 10 letter word FRIPPERIES
I've seen this crossword clue in Financial Times
F
R
I
P
P
E
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S
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The straight part
We know that "trinkets" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case trinkets = fripperies.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 FRIPPERIES mean?
FRIPPERIES noun- Ostentation, as in fancy clothing.
- Useless things; trifles.
- Cast-off clothes.
- The trade or traffic in old clothes.
- The place where old clothes are sold.
- Hence: secondhand finery; cheap and tawdry decoration; affected elegance.