1: 4-down Arias hit high note in some of the lungs (3,3)
2: However, you expect trouble at first (3)
3: Explorer taking stuff back and beginning to observe game (5,4)
4: Fill-in professional almost rewrote the column (5)
5: One who heals despicable person on TV hospital program (5)
8: Silver inside for each calling device (5)
9: Put a new value on what secret agent is hiding (5)
12: Sounds like a bright child (3).
13: Lifeblood of dope (3)