2: Hazardous emanation from river used by a crime boss (5)
 3: Tom Cruise playing an outfitter (9)
 4: Bend in the middle and wind back (3)
 5: Part of stair is erect (5)
 8: A girl in distress, sought by knights (5)
 9: The sound of a piano is excruciating (5)
 11: Perfect counter-spy equipment (3)