Crossword Genius

Shout just before the crashing plane hits the ground? (6)

Ross

I believe the answer is:

timber

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'the ground?' is the definition.
(timber is a kind of ground)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for timber that I've seen before include "Wood that's been cut and prepared" , "Wood (that may be shivered?)" , "Feller's warning cry" , "Warning cry that a tree is about to fall" , "wooden" .)

I've seen this clue in the Evening Standard.
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