Answer:
In a tunnel of darkness lies a beast or iron. It can only attack when pulled back. What is it?
I can be thin but not fat; in your body but never on your placemat. I'm always better when I'm fresh but you'll never see me in the flesh.
I am flora not fauna. I am foliage not trees. I am shrubbery not grass.
Long and thin red within with a nail at the end.
I have a head but never weeps. I have a bed but never sleeps. I can run but never walks. I have a bank but no money. What am I?
Runs over fields and woods all day. Under the bed at night sits not alone, With long tongue hanging out, Resting at your feet until we go for a walk