Spiteful sort (5)
I believe the answer is:
hater
'spiteful sort' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for hater that I've seen before include "One loathing" , "Heart (anag.)" , "Antipathetic type" , "One disliking" , "He loathes" .)