Crossword Genius

One used in dressing a window? (4)


I believe the answer is:


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This clue might be a double definition.

'one used in dressing' is the first definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'a window?' is the second definition.
(I've seen this before)

Can you help me to learn more?

(Other definitions for sash that I've seen before include "Girdle" , "Style of window" , "Decorative belt" , "Decoration for the twelfth" , "Sliding window frame" .)

I've seen this clue in the Evening Standard.
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