Hate endless study before exam? (6)
I believe the answer is:
detest
'hate' is the definition.
(to detest is to hate or loathe)
'endless study before exam?' is the wordplay.
'endless' means to remove the last letter.
'study' becomes 'den' (term for a study or office).
'before' says to put letters next to each other.
'exam?' becomes 'test' (synonyms).
'den' with its last letter removed is 'de'.
'de'+'test'='DETEST'
(Other definitions for detest that I've seen before include "Not like" , "Dislike intensely, think badly of" , "Hate a lot" , "Having a loathing" , "Dislike heartily" .)