2: Driver who's disappeared in conflict (7)

5: Have bananas now (3)

6: I hear mantas and surface (5)

8: State control for Romanians (3,6)

10: Ensemble originally formed with ocarina, cello, theremin, euphonium, and tabla (5)

11: Frost to cover the cake (3)

12: 'Observe!' I cry to the audience (7)

1: Dear benders (5)

2: Tightener with improved tuning (4,3)

3: Giant fish, note, approaches Italian city (not capital) (9)

4: Fish spawn upstream in little orifices (3)

7: Briefly sign first (7)

9: Adore inconstant nymph (5)

10: Nothing we have to pay (3)