Detest swear-word appearing in French article (6)
I believe the answer is:
loathe
'detest' is the definition.
(loathing is a kind of detesting)
'swear-word appearing in french article' is the wordplay.
'swear-word' becomes 'oath' (I've seen this before).
'appearing in' is an insertion indicator.
'french article' becomes 'le' (french for 'the' - definite article).
'oath' put within 'le' is 'LOATHE'.
(Other definitions for loathe that I've seen before include "Can't abide" , "Abhor, detest" , "Abhor, abominate" , "Dislike intensely" , "Abhor, execrate" .)