Wood cut, backward edge supporting framework (7)

I believe the answer is:

trellis

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'supporting framework' 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 trellis that I've seen before include "garden equipment" , "Plant-training lattice" , "Arch of latticework" , "latticework in the garden" , "Structure supporting climbing plants" .)

I've seen this clue in The Times.

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