Dislike of French exam (6)
I believe the answer is:
detest
'dislike' is the definition.
(to detest is to strongly dislike)
'of french exam' is the wordplay.
'of french' becomes 'de' ('of' in French).
'exam' becomes 'test' (synonyms).
'de'+'test'='DETEST'
(Other definitions for detest that I've seen before include "Despise or loathe" , "Not like" , "Hate a lot" , "Cordially laothe" , "Loathe, hate intensely" .)