Girl Scout's accessory (4)
I believe the answer is:
sash
'girl scout's accessory' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sash that I've seen before include "Brown bread for waist or shoulder" , "Framework to hold the panes of a window" , "Long strip of material - window frame" , "Popular band in Northern Ireland" , "Window frame - shoulder band" .)