The most common and most likely answer to this crossword clue is the 3 plus 4 letter word ART DECO
A
R
T
D
E
C
O
More clues leading to the result ART DECO
- Redcoat's unconventional style
- Firm chasing flexible trade style
- Red coat fashioned in 1930s style
- Rated new company's architectural style
- Cunning Italian author entertains duke in style
- Style of fancy red coat
- Little boy, a month old, showing a certain style
- Redcoat arrayed in 20th century style
- Periodically parroted European writer's style
- Style that’s 7 damaged trade with business
Buddy explains!

The straight part
We know that "architectural style" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case architectural style = art deco.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.