Not even peculiar (3)
I believe the answer is:
odd
This clue is a double definition.
'not even' is the first definition.
('odd' is the opposite to 'even')
'peculiar' is the second definition.
(I know that peculiar can be written as odd)
(Other definitions for odd that I've seen before include "Freakish" , "Not even; strange" , "Not even? That's peculiar" , "standing out from the crowd?" , "Number not divisible by two" .)