Unfamiliar person (8)
I believe the answer is:
stranger
'unfamiliar person' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for stranger that I've seen before include "More curious or unfamiliar" , "More rum" , "'Weirder, odder (8)'" , "Odder, more peculiar" , "More exotic" .)