Not above using two foreign articles (5)

I believe the answer is:

under

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'foreign articles' is the definition.

'not above using two' is the wordplay.
'not' becomes 'un' (prefix meaning 'not').
'above using two' becomes 'der' (I am not sure about this - if you are sure you should believe this answer much more).
'un'+'der'='UNDER'

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(Other definitions for under that I've seen before include "Less than" , "Subject to the authority of" , "In a state of unconsciousness" , "Covered" , "Sub" .)

I've seen this clue in The Globe and Mail.

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