Confuse ref with fluke involving loud commotion (9)
I believe the answer is:
kerfuffle
'commotion' is the definition.
(I know that commotion can be written as kerfuffle)
'confuse ref with fluke involving loud' is the wordplay.
'confuse' indicates anagramming the letters.
'with' means one lot of letters go next to another.
'involving' is an insertion indicator.
'loud' becomes 'f' (short for forte - 'loud' in music).
'ref' put after 'fluke' is 'flukeref'.
'flukeref' is an anagram of 'kerfufle'.
'kerfufle' going around 'f' is 'KERFUFFLE'.
(Other definitions for kerfuffle that I've seen before include "Fuss" , "Palaver" , "Hoo-ha" , "Agitation" , "Commotion" .)