Social rebuff (4)
I believe the answer is:
snub
'social rebuff' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for snub that I've seen before include "put down" , "Rude rejection" , "A rebuff for turned-up sort of nose" , "Ignore, send to Coventry" , "Reject a person with cold behaviour" .)