Watch positioned around the original Birnam Wood (6)

I believe the answer is:

timber

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'wood' is the definition.
(I know that timber is a type of wood)

I don't understand the rest of the clue.

(Other definitions for timber that I've seen before include "Tree-feller's cry" , "Feller's warning cry" , "Wood for building, etc" , "Wood that's been cut and prepared" , "Lumber" .)

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

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