Unusually, strangely (5)
I believe the answer is:
oddly
This clue is a double definition.
'unusually' is the first definition.
(both can mean strangely)
'strangely' is the second definition.
(I know that strangely can be written as oddly)
(Other definitions for oddly that I've seen before include "Strangely, curiously" , "Weirdly" , "In a peculiar way" , "This clue [32A] is not numbered so" , "strange to say?" .)