Crossword Genius

Bark threads woven into fabric (4)

Ross

I believe the answer is:

woof

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'bark' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for woof that I've seen before include "Something woven" , "Cry of dog - texture of fabric" , "Sound of dog's bark" , "As dog goes" , "boxer's outburst" .)

I've seen this clue in the Sydney Morning Herald.
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