Foreign article contains fib (5)
I believe the answer is:
alien
'foreign' is the definition.
(similar in meaning)
'article contains fib' is the wordplay.
'article' becomes 'an' (indefinite article).
'contains' indicates putting letters inside.
'fib' becomes 'lie' (a fib is a lie).
'an' enclosing 'lie' is 'ALIEN'.
(Other definitions for alien that I've seen before include "repugnant" , "24a [ESTRANGE]" , "Outlandish" , "immigrant" , "Creature from another planet" .)