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' (A musical term).
'with' indicates putting letters inside.
'kit' becomes 'rig' (I've seen this before).
'confuse' is an anagram indicator.
'then' is an anagram of 'hten'.
'rig' going within '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" .)