Twigs handled in the garden (5)

I believe the answer is:

besom

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'garden' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see an association between them that I can't see?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

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

I've seen this clue in the Evening Standard.

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