Repugnant article contains fabrication (5)
I believe the answer is:
alien
'repugnant' is the definition.
(I've seen this before)
'article contains fabrication' is the wordplay.
'article' becomes 'an' (indefinite article).
'contains' indicates putting letters inside.
'fabrication' becomes 'lie' (I've seen this before).
'an' placed around 'lie' is 'ALIEN'.
(Other definitions for alien that I've seen before include "Clanger?" , "Creature from another planet" , "Belonging to a foreign country" , "Being from another world" , "extraneous" .)