A subject for those who have a mind to study (10)
I believe the answer is:
psychiatry
This might be a double definition.
'a subject for those who have a mind' is the first definition.
'psychiatry' can be an answer for 'a subject' (psychiatry is a kind of subject). I am not sure about the remainder of the definition.
'to study' is the second definition.
(psychiatry is a kind of study)
Can you help me to learn more?
(Other definitions for psychiatry that I've seen before include "Treatment of the mind" , "Treatment of mental problems" , "Branch of medicine dealing with mental disorders" , "Trick cyclist's profession?" , "Branch of medicine concerned with mental disorders" .)