Strangeness (6)
I believe the answer is:
oddity
'strangeness' is the definition.
(I know that oddity is a type of strangeness)
This is all the clue.
(Other definitions for oddity that I've seen before include "Something strange or eccentric" , "Curiosity, curio" , "Strange person/thing" , "Curious item" , "rare thing" .)