Treat with indifference (4-8)
I believe the answer is:
cold-shoulder
'treat with indifference' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for cold-shoulder that I've seen before include "Treat with indifference" , "Snub" , "Give (someone) a rebuff" , "Cut, ignore" , "Brush off" .)