Crossword Genius

Should it be made from brushwood? (5)

Ross

I believe the answer is:

besom

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'brushwood?' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for besom that I've seen before include "cleaner?" , "Twig-broom" , "sweeper" , "Lazy woman" , "Twiggy broom" .)

I've seen this clue in The Globe and Mail.
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