Crossword Genius

Timber also something purchased, pro heard (3-2-4)

Ross

I believe the answer is:

two-by-four

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'timber' is the definition.
(two-by-four is a kind of timber)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for two-by-four that I've seen is " Piece of timber popularly trimmed for construction work".)

I've seen this clue in The Independent.
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