Amusing? How odd! (5)
I believe the answer is:
funny
I believe this clue is a double definition.
'amusing?' is the first definition.
(I've seen this in another clue)
'odd' is the second definition.
(I've seen this in another clue)
'how' acts as a link.
(Other definitions for funny that I've seen before include "Strange; comic" , "Comical" , "Droll -- suspicious" , "Odd - amusing" , "Ha-ha or peculiar?" .)