Violent confrontation to experience: I’m slapped on the face (10)
I believe the answer is:
aftershave
'i'm slapped on the face' is the definition.
(aftershave goes on someone's face)
'violent confrontation to experience' is the wordplay.
'violent confrontation' becomes 'afters' (afters can mean a confrontation in a football game).
'to experience' becomes 'have' ('have' can be a synonym of 'experience').
'afters'+'have'='AFTERSHAVE'
(Other definitions for aftershave that I've seen before include "liquid splashed in bathroom" , "I'm slapped on the face" , "styptic lotion" , "Fragrance" , "alcohol to splash on, say" .)