1: What this puzzle is (3)
3: Crowd scene actor appearing in special edition (5)
5: Betraying no emotion when Greek god has first expired (7)
7: Starshine somehow loses its shine (9)
9: Medicine was our connection, we hear (7)
11: Adore inconstant nymph (5)
12: 4-down Arias hit high note in some of the lungs (3,3)