Shout just before the crashing plane hits the ground? (6)
I believe the answer is:
timber
'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" .)