King Edward's first upset brought about fine commotion! (9)
I believe the answer is:
kerfuffle
'commotion' is the definition.
(I know that commotion can be written as kerfuffle)
'king edward's first upset brought about fine' is the wordplay.
'first' says to take the initial letters.
'upset' becomes 'ruffle' (ruffle can mean to upset or mess up).
'brought about' means one lot of letters goes inside another.
'fine' becomes 'f' (abbreviation).
The first letters of 'king edwards' is 'ke'.
'ruffle' enclosing 'f' is 'rfuffle'.
'ke'+'rfuffle'='KERFUFFLE'
(Other definitions for kerfuffle that I've seen before include "Agitation" , "Palaver" , "Commotion" , "Fuss" , "Noisy disturbance" .)