Ornate architectural style (6)
I believe the answer is:
rococo
'ornate architectural style' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rococo that I've seen before include "Ornamental style associated with Louis XV" , "With an ornately decorated style" , "Late baroque style (of furniture or architecture)" , "showing lots of curves?" , "Ornate style of decoration." .)