Possible Clues:

• Anticipate
• Get in first with nothing but trees there
• Gets in first with nothing but woodland!
• Thwart made of wood, entirely
• Anticipate no relaxation during trip
• Stop everybody going under the trees
• Zero sleep taken during trip, so stop
• Prevent old place entering collapse
• Get in first with what is entirely covered in trees, it seems
• Everybody would, say, first anticipate