Hates day before English exams (7)
I believe the answer is:
detests
'hates' is the definition.
('detest' can be a synonym of 'hate')
'day before english exams' is the wordplay.
'day' becomes 'd' (abbreviation for day).
'before' says to put letters next to each other.
'english' becomes 'e' (abbreviation).
'exams' becomes 'tests' ('test' can be a synonym of 'exam').
'd'+'e'+'tests'='DETESTS'
(Other definitions for detests that I've seen before include "Loathes" , "Abominates" , "Hates" , "Abhors" , "Cordially loathe" .)