The most common and most likely answer to this crossword clue is the 9 letter word SCINTILLA
I've seen this crossword clue in The Times
S
C
I
N
T
I
L
L
A
More clues leading to the result SCINTILLA
- Hint from small Scouse singer inspiring in tango
- Extraordinarily call sit-in for small thing
- Trace stray ploughman by ear
- Hint of envy maybe — director speaking out
- A little error linked to steerage system, we hear
- One cultivating wickedness speaking a tiny bit
- Can I still cast piece of little substance?
- Trace reported fault with steering device
- I can still broadcast a little bit
- Isn't lilac fancy, just a little bit?
Buddy explains!

The straight part
We know that "Trace" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case trace = scintilla.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 SCINTILLA mean?
SCINTILLA noun- A small spark or flash.
- A small or trace amount.