Foreign articles erode lingerie (9)
I believe the answer is:
underwear
'lingerie' is the definition.
(lingerie is a type of underwear)
'foreign articles erode' is the wordplay.
'foreign articles' becomes 'under'.
'erode' becomes 'wear' (I've seen this in another clue).
'under'+'wear'='UNDERWEAR'
(Other definitions for underwear that I've seen before include "Garments worn beneath other clothes" , "Vest, pants etc" , "Drawers" , "Hidden clothing" , "bra, perhaps?" .)