Rare or unusual item (5)
I believe the answer is:
curio
'rare or unusual item' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for curio that I've seen before include "Intriguing object worth collecting" , "something odd" , "Rare thing sought for collection" , "Interesting object of rarity or difference" , "Antique" .)