Like a rude remark (5)
I believe the answer is:
snide
'like a rude remark' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for snide that I've seen before include "Dines (anag.)" , "Sneering in a sly way - dines out on it" , "Sneering, supercilious" , "Mean, base" , "Indirectly mocking" .)