Odd, unusual (7)
I believe the answer is:
strange
I believe this clue is a double definition.
'odd' is the first definition.
(I know that odd can be written as strange)
'unusual' is the second definition.
(I know that unusual can be written as strange)
(Other definitions for strange that I've seen before include "Peculiar; Morse's boss" , "as quarks in certain hadrons" , "Super for a couple here" , "Odd or unfamiliar" , "Unusual, surprising" .)