Crossword Genius

Turn over a thick plank, possible surfboard material (5)

Ross

I believe the answer is:

balsa

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'material' is the definition.
(balsa is a kind of material)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for balsa that I've seen before include "Something light" , "Tree yielding light wood" , "Tree with light soft wood" , "Strong lightweight wood" , "lightweight boat-builder" .)

I've seen this clue in The Independent.
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