Sales items Neil’s shifting (5)
I believe the answer is:
lines
'sales items' is the definition.
(a line can mean a range of products)
'neil's shifting' is the wordplay.
'shifting' indicates anagramming the letters.
'neils' anagrammed gives 'LINES'.
(Other definitions for lines that I've seen before include "Marks" , "Long thin strokes" , "form of school punishment" , "imposition" , "Actor's text" .)