The most common and most likely answer to this crossword clue is the 9 letter word PRETTIEST
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Buddy explains!
The straight part
We know that "Most charming" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case most charming = prettiest.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 PRETTIEST mean?
PRETTIEST adjective- Pleasant to the sight or other senses; attractive, especially of women or children, but less strikingly than something beautiful.
- Of objects or things: nice-looking, appealing.
- Fine-looking; only superficially attractive; initially appealing but having little substance; see petty.
- Cunning; clever, skilful.
- Moderately large; considerable.
- Excellent, commendable, pleasing; fitting or proper (of actions, thoughts etc.).
- Awkward, unpleasant.