Antipathetic sort scoffed, introduced to personnel (5)
I believe the answer is:
hater
'antipathetic sort' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'scoffed introduced to personnel' is the wordplay.
'scoffed' becomes 'ate' ('to scoff' is to eat).
'introduced to' indicates putting letters inside.
'personnel' becomes 'HR' (Human Resources).
'ate' placed into 'hr' is 'HATER'.
Can you help me to learn more?
(Other definitions for hater that I've seen before include "Heart (anag.)" , "Person showing animosity" , "I really can't stand" , "One disliking" , "Antipathetic type" .)