Body protection for one who's paid to slice one (5)
I believe the answer is:
apron
'body protection' is the definition.
(garment that protects one's body)
'one who's paid to slice one' is the wordplay.
'one who's paid' becomes 'pro' (professional as opposed to an amateur).
'to slice' indicates putting letters inside (inserted letters slice their way in).
'one' becomes 'an' (an apple is one apple).
'pro' placed into 'an' is 'APRON'.
'for' acts as a link.
(Other definitions for apron that I've seen before include "Projecting stage" , "Cook's protector" , "item of protective clothing" , "Kitchen garment or airfield surface." , "Protective garment in kitchen" .)