A father gets over your indifference (6)
I believe the answer is:
apathy
'indifference' is the definition.
(I know that indifference can be written as apathy)
'a father gets over your' is the wordplay.
I cannot quite understand how this works, but
'a' is found in the answer.
'father' could be 'pa' (pa can mean dad or father) and 'pa' is located in the answer.
'your' could be 'thy' ('thy' historically meant 'your') and 'thy' is present in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for apathy that I've seen before include "lack of involvement" , "Indifferent quality" , "Lack of interest or concern" , "Lack of emotion and interest" , "Absence of interest or emotion" .)