1: 4-down Arias hit high note in some of the lungs (3,3)
3: Roman date and time that is in Latin (2,3)
5: Tippecanoe is home to a nut (5)
6: Freshen the atmosphere (3)
7: Ban professional writer (9)
8: Mediterranean leaves unfashionable coins? (3)
9: The lowest point in a dire section (5)
12: Sound of river crossing (3)