Unusual, odd (7)
I believe the answer is:
strange
I believe this is a double definition.
'unusual' is the first definition.
(I know that unusual can be written as strange)
'odd' is the second definition.
(I've seen this in another clue)
(Other definitions for strange that I've seen before include "Odd, peculiar" , "as quarks in certain hadrons" , "Weird, eerie" , "Out of the ordinary" , "Eccentric" .)