The most common and most likely answer to this crossword clue is the 8 letter word MYSTIQUE
I've seen this crossword clue in Financial Times
M
Y
S
T
I
Q
U
E
More clues leading to the result MYSTIQUE
- Secret fascination of Miss Wood, we hear
- Gosh! It's about that Gallic aura
- Romance of my strange quest to take in India
- Young lady transmitted quite unusual ‘je ne sais quoi‘
- How intelligent I am to keep way above upper echelons, initially – powerful aura!
- Magic of mist, say — swirling quite timelessly
- The charm of Europe is up my street, with intelligence above all
- Gosh, one in quest fabricated incommunicable quality
- Fascinating quality in the writer’s style, initially quite varied
- Feel the absence of wood, said to bring aura
Buddy explains!

The straight part
We know that "The charm" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case the charm = mystique.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 MYSTIQUE mean?
MYSTIQUE noun- An aura of heightened interest, meaning or mystery surrounding a person or thing.