It's hated to give man a heat treatment (8)
I believe the answer is:
anathema
'it's hated to' is the definition.
I can't tell whether this definition defines the answer.
'man a heat treatment' is the wordplay.
'treatment' is an anagram indicator (letters treated or processed differently).
'man'+'a'+'heat'='manaheat'
'manaheat' anagrammed gives 'ANATHEMA'.
'give' acts as a link.
Can you help me to learn more?
(Other definitions for anathema that I've seen before include "Object of abhorrence" , "Curse; object of loathing" , "Someone or something that is detested" , "Formal church curse of excommunication" , "thing we detest" .)