Not the more usual foreigner (8)
I believe the answer is:
stranger
'foreigner' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for stranger that I've seen before include "Someone unfamiliar" , "The unknown one is more unusual" , "Truth can be ... than fiction" , "More odd or weird" , "Unfamiliar person" .)