They take panes (6)
I believe the answer is:
'they take panes' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sashes that I've seen before include "They're worn over shoulders" , "They hold the glass in window frames" , "Broad bands worn over the shoulder" , "Fabric bands worn around body" , "Ornamental cloth bands me father wore in song?" .)