Refuse to accept study year (4)
I believe the answer is:
deny
'refuse to accept' is the definition.
(I've seen this before)
'study year' is the wordplay.
'study' becomes 'den' (term for a study or office).
'year' becomes 'y'.
'den'+'y'='DENY'
(Other definitions for deny that I've seen before include "Refuse to acknowledge" , "Abnegate" , "Declare non-existent" , "Negate" , "contest" .)