Record crushing remark (3-4)
I believe the answer is:
put-down
This clue is a double definition.
'record' is the first definition.
(synonyms)
'crushing remark' is the second definition.
(I've seen this before)
(Other definitions for put-down that I've seen before include "Crushing remark" , "Humiliating remark" , "Snub" .)