The most common and most likely answer to this crossword clue is the 6 letter word MANNER
I've seen this crossword clue in The Guardian
M
A
N
N
E
R
More clues leading to the result MANNER
- Fashion house, we hear?
- Style of large house spoken of
- Style of emperor, short on staff
- Way a man embraces a queen
- Style of plain title girl received
- Bread of Heaven broadcast in style
- Sounds like a big house in a way
- Married princess with royal appearance
- Finally complete paper on novelist’s style
- Say “hallway“!
Buddy explains!

The straight part
We know that "Style" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case style = manner.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 MANNER mean?
MANNER noun- Mode of action; way of performing or doing anything
- Characteristic mode of acting or behaving; bearing
- One's customary method of acting; habit.
- Good, polite behaviour
- The style of writing or thought of an author; the characteristic peculiarity of an artist.
- A certain degree or measure.
- Sort; kind; style.
- Standards of conduct cultured and product of mind.