Japanese band? (3)
I believe the answer is:
'japanese band?' is the definition.
(type of Japanese belt)
This is all the clue.
(Other definitions for obi that I've seen before include "Form of witchcraft" , "Kimono sash; W. African sorcery" , "Broad Japanese sash" , "Broad sash worn with a kimono" , "Sash worn on Japanese kimono" .)