Partial duplication of travel document is concerning (3-1-3)
I believe the answer is:
vis-a-vis
'is concerning' is the definition.
I don't understand the remainder of the clue.
(Other definitions for vis-a-vis that I've seen before include "Facing; in relation to" , "In relation to, as compared with" , "Face-to-face" , "With regard to" .)