Alien, strange (7)
I believe the answer is:
foreign
I believe this clue is a double definition.
'alien' is the first definition.
(I know that alien can be written as foreign)
'strange' is the second definition.
(I know that strange can be written as foreign)
(Other definitions for foreign that I've seen before include "Overseas" , "Of or from another country" , "Exotic" , "Of other countries" , "Not domestic" .)