Foreign article contains fabrication (5)
I believe the answer is:
alien
'foreign' is the definition.
('alien' can be a synonym of 'foreign')
'article contains fabrication' is the wordplay.
'article' becomes 'an' (indefinite article).
'contains' is an insertion indicator.
'fabrication' becomes 'lie' (I've seen this before).
'an' placed around 'lie' is 'ALIEN'.
(Other definitions for alien that I've seen before include "Someone from outer space?" , "Belonging to a foreign country" , "Foreign (from outer space?)" , "immigrant" , "Foreigner, outsider" .)