Withdraw foreign article by Express (5)
I believe the answer is:
unsay
'withdraw' is the definition.
('unsay' can be a synonym of 'withdraw')
'foreign article by express' is the wordplay.
'foreign article' becomes 'un'.
'by' says to put letters next to each other.
'express' becomes 'say' (I've seen this before).
'un'+'say'='UNSAY'
(Other definitions for unsay that I've seen before include "Recall" , "Take back (words)" .)