Detest curse in French article (6)
I believe the answer is:
loathe
'detest' is the definition.
(loathing is a kind of detesting)
'curse in french article' is the wordplay.
'curse' becomes 'oath' (synonyms).
'in' is an insertion indicator.
'french article' becomes 'le' (definite article in French).
'oath' put inside 'le' is 'LOATHE'.
(Other definitions for loathe that I've seen before include "Feel intense dislike or disgust for" , "Abhor, execrate" , "Can't stand" , "Abhor, abominate" , "cannot stand" .)