Crossword Genius

Frame this, with wits! (4)

Ross

I believe the answer is:

sash

I'm a little stuck... Click here to teach me more about this clue!

'frame' is the definition.
(I know that sash is a type of frame)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for sash that I've seen before include "Decorative belt" , "Frame for a windowpane" , "Band - scarf" , "Ribbon worn over the shoulder" , "Brown bread for waist or shoulder" .)

I've seen this clue in The Telegraph.
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