First word is one less than ten; the second, A four-letter measure used metric and imperial then. The last is pounded hard into a wall, To keep something fixed, or hang it tall. Three words together, a band of repute; My lead singer, Reznor, resonates with many a techno fan.

I surround the castle, deep and wide, Keeping foes away with watery pride. What am I?

Notice me and see how I sit atop all the chaps, Guarding pates from sun's hot slap. With a brim so wide, or non-existent and narrow, I crown thee a stylish shield, so no need to bellow!

Beaches have me, and my solid form travels with packages. I emerge when dirty dishes are done. What am I?

I lie on the floor, cozy and snug, Soft woven threads in a warm little hug. Spread out below where footsteps all tread, Adding some comfort wherever you head.