1: Something useful - like a matching collection? (5)
2: One who heals despicable person on TV hospital program (5)
3: Lined salt shaker made ready for use (9)
4: Implement box for young cat (3)
5: Pious woman in underground hideaway (3)
9: Dizzy Ben is a playwright (5)
10: Drain off lowest part (5)
11: Heavy metal group X (4)
12: Crook skimmed cash register? (3)