Note that the two words in the answer are anagrams of each other.
Ex: Highest saucepan = top pot.
-1. Macbeth's weapon is notched. 2 words, first letters r,d
-2. Clever sculpture. 2, a,s
-3. Looked further in. 2, p,d
4. Garments for mourning? 2, s,r
5. Serious sea birds. 2, s,t
6. Cattle boat. 2, c,s
7. Dirty den. 2, d,s
8. Every pain. 2, e,a
-9. Member of the upper house of the US Congress commits betrayal of trust. 2, s,t
-10. Illicitly purloins bunch of wool from winter hat. 2, s,t