1: Polygraph unexpectedly traps vandal (3)
2: Do springs help American author? (3,6)
3: Evita, for example, making false claim about American (7)
4: The sound of a piano is excruciating (5)
6: Betraying no emotion when Greek god has first expired (7)
8: Biting piece of chocolate with dry exterior (5)
11: Right, turn right to play with robot (3)