Hate from French trial (6)
I believe the answer is:
detest
'hate' is the definition.
(to detest is to hate or loathe)
'from french trial' is the wordplay.
'from french' becomes 'de' ('from' in French).
'trial' becomes 'test' (synonyms).
'de'+'test'='DETEST'
(Other definitions for detest that I've seen before include "Really dislike" , "Cordially dislike and loathe" , "Dislike thoroughly" , "Be unable to stand" , "Dislike intensely, loathe" .)