4: Aluminum silicate minerals
5: Activity resulting in a net gain?
6: Object of pagan worship
7: It makes a clicking noise
11: Something that might make the fur fly?
12: Voice mail imperative
19: One building buildings?
26: Expanse near the Capitol
27: Get ready for a fight
34: Good shot, in horseshoes
36: Straighten, as wheels
37: Novel setting for Solzhenitsyn
44: Butter and peanut butter
63: Winner at Caesar's palace?