Possible Clues:

• Sack fiber
• Project close to failure: sacking may come from it
• Gunnysack makeup
• Fibre used for making sacking and ropes
• Protrude over centre of green fibrous plant
• One ultimately gets stick over possible future sacking
• Project onset of endless growth
• Rope fiber or ancient German
• Growth found to stick out on end of toe
• Get stick out to face European invader