Frame the band (4)
I believe the answer is:
sash
This clue is a double definition.
'frame' is the first definition.
(sash is a kind of frame)
'band' is the second definition.
(a band of material)
'the' is the link.
(Other definitions for sash that I've seen before include "Type of sliding window" , "Part of a window - decoration" , "type of cord?" , "Style of window" , "Long strip of material - window frame" .)