Son leaving school with gypsy misbehaving in the head’s study (10)
I believe the answer is:
psychology
'head's study' is the definition.
'psychology' can be an answer for 'study' (psychology is a kind of study). I am not certain of the 'head's' bit.
'son leaving school with gypsy misbehaving' is the wordplay.
'son' becomes 's' (genealogical abbreviation for son).
'leaving' indicates named letters should be taken away.
'with' is a charade indicator (letters next to each other).
'misbehaving' indicates an anagram.
'school' after 'gypsy' is 'gypsyschool'.
'gypsyschool' with 's' removed is 'gypyschool'.
'gypyschool' with letters rearranged gives 'PSYCHOLOGY'.
'in the' is the link.
Can you help me to learn more?
(Other definitions for psychology that I've seen before include "Study of human and animal behaviour" , "Study of the mind and its functions" , "Science of the mind" , "Jung's field" .)