Sentence:  The Coldstream Guards were already in place and knocked on the door. Daz Farrugia stood at the door with the Iraqi <WSD>interrupter</WSD>. ... The door opened and a middle aged Iraqi man stood there in his pajamas, gobbing off in Arabic, saying who knows what, but I guessed it was not very complimentary; the interpreter managed to calm him down. 
Meaning of the word marked with <WSD> tags:  An interpreter (person who interprets speech in a foreign language)