Eccentricity (7)
I believe the answer is:
oddness
'eccentricity' is the definition.
(I know that oddness is a type of eccentricity)
This is all the clue.
(Other definitions for oddness that I've seen before include "It isn't even" , "Peculiarity characteristic" , "a peculiarity of character" , "Eccentricity" , "Peculiar quality" .)