Obi (4)
I believe the answer is:
sash
'obi' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sash that I've seen before include "Waistband - type of window" , "Strip of cloth - type of window" , "Ribbon as a symbol of rank" , "type of cord?" , "Broad band, the one me father wore?" .)