Answer:
A precious fluid, thicker than water.
What is that over the head and under the hat?
Grows from the ground, bushes and grass, leaves of yellow, red and brow, unruly plants, get the axe, trim the hedge back down.
What is the freedom of birds and the pen of old men?
You throw away the outside, eat the inside, then throw away the inside. What is it?
What do angels sing in the shower?