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

4: Call for help oddly stops (3)

7: Slip in terror (5)

8: Shock with exclamations while mounting horse (9)

10: Go up cedar's first branch (5)

11: Wander around inside territory (3)

12: Reptile eventually climbing a hill (5)

2: Belgian port getting rid of an idiot (5)

3: Exciting object getting rent by stream (9)

4: Now Elton heard California's big one (3)

5: Some slippers and also shoes (7)

6: On second thoughts, rising fish glitter (7)

9: Path of planet - or particle (5)

10: See, you are a cad. (3)