Crossword Genius

Punishment in the wood (5)

Ross

I believe the answer is:

birch

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

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for birch that I've seen before include "See 1" , "Flogging rod" , "Silver-white barked tree" , "Flog" , "Tree, maybe silver" .)

I've seen this clue in The Mirror.
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