Unusual article, strange, not American (5)
I believe the answer is:
curio
'unusual article' is the definition.
(I've seen this in another clue)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for curio that I've seen before include "Object that is interesting, being rare or unusual" , "odd thing" , "(Unusual) collector's item" , "Something unusual, perhaps worthy of collecting" , "Oddity, rarity" .)