Shock loudly with kit, then confuse (8)
I believe the answer is:
frighten
'shock' is the definition.
(I've seen this before)
'loudly with kit then confuse' is the wordplay.
'loudly' becomes 'f' (short for forte - 'loud' in music).
'with' is an insertion indicator.
'kit' becomes 'rig' (I've seen this before).
'confuse' indicates an anagram.
'then' with letters rearranged gives 'hten'.
'rig' put into 'hten' is 'righten'.
'f'+'righten'='FRIGHTEN'
(Other definitions for frighten that I've seen before include "Put the wind up" , "Cause alarm" , "Spook" , "Cause fear" , "Cow" .)