Top student in school's harder form (6,7)
I believe the answer is:
rhodes scholar
'top student' is the definition.
'rhodes scholar' can be an answer for 'student' (I've seen this before). I am not certain of the 'top' bit.
'school's harder form' is the wordplay.
'form' indicates anagramming the letters (another form of the letters).
'schools'+'harder'='schoolsharder'
'schoolsharder' with letters rearranged gives 'RHODES SCHOLAR'.
'in' is the link.
Can you help me to learn more?
(Other definitions for rhodes scholar that I've seen before include "Foreign student" , "Oxford award holder" , "Oxford University student with particular award" .)