Ruthless critic (5)
I believe the answer is:
hater
(Other definitions for hater that I've seen before include "Person showing animosity" , "Heart (anag.)" , "Unpleasant type" , "Antipathetic type" , "He loathes" .)
I believe the answer is:
hater
(Other definitions for hater that I've seen before include "Person showing animosity" , "Heart (anag.)" , "Unpleasant type" , "Antipathetic type" , "He loathes" .)