Possible Clues:

• Not having been walked on
• Description of virgin territory don turned out
• Never having put one's foot down like this
• Don turned off, such are Wordsworth's ways
• As virgin soil turned on field, finally ploughed up
• Blunt rod, dense at the centre, like an overgrown path?
• Lacking tracks
• Where one has not yet put one's foot down
• Not trampled under, don't move!
• That's what it's like where Walker has not been