1: The huntress about to be put in the Labyrinth to find the source of the thread. (7)
2: Erin's heir is hardly content (5)
3: Tool placed under sack as a safety precaution (4,5)
4: Sister gets nothing, we hear (3)
7: Eminent performer in some art form (7)
9: A Muslim leader's energy efficiency ratio as a Muslim leader (5)
11: Arcking shot from Bill O'Brien (3)