The most common and most likely answer to this crossword clue is the 6 letter word RAKISH
I've seen this crossword clue in The Sunday Telegraph
R
A
K
I
S
H
More clues leading to the result RAKISH
- Libertine in cap of khaki, one covered in spots
- Dissolute son primarily hooked on strong oriental drink
- Turkish spirit used to be smart
- Jaunty king is beset by joyful cry
- Dissolute king, one covered in spots?
- Jaunty queen and king half hidden in wood
- Dissolute king half consumed by evidence of herpes?
- Dashing from shark at sea, one getting caught
- Dashing family mostly involved in outbreak
- Dashing and reckless — one king about to be captured
Buddy explains!

The straight part
We know that "Dashing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case dashing = rakish.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 RAKISH mean?
RAKISH adjective- Dashingly, carelessly, or sportingly unconventional or stylish; jaunty; characterized by a devil-may-care unconventionality; having a somewhat disreputable quality or appearance.
- Like a rake; dissolute; profligate.