Foreigner making Marianne confused (8)
I believe the answer is:
armenian
'foreigner' is the definition.
(someone from Armenia)
'marianne confused' is the wordplay.
'confused' indicates an anagram.
'marianne' with letters rearranged gives 'ARMENIAN'.
'making' acts as a link.
(Other definitions for armenian that I've seen before include "Eg, native of Yerevan" , "language" , "ethnic group in Asia" , "Person from Yerevan, say" , "of the Southern Caucasus" .)