Elaborate style originally rousing one famous clown (6)
I believe the answer is:
rococo
'elaborate style' is the definition.
(I've seen this before)
'originally rousing one famous clown' is the wordplay.
'originally' indicates taking the first letters.
'famous clown' becomes 'coco' (Coco the Clown, 20th-century clown).
The initial letters of 'rousing one' is 'ro'.
'ro'+'coco'='ROCOCO'
(Other definitions for rococo that I've seen before include "Ornate style of decoration." , "Late baroque style (of furniture or architecture)" , "18th-century French style" , "Style of architecture, art, etc associated with the time of Louis XV" , "Late Baroque artistic style" .)