1: Unscripted part for head librarian (2,3)
4: Frost to cover the cake (3)
6: Essential part of Cayce's power! (3)
7: New roles for a flop (5)
8: Piece of pottery containing drink to make beast tender (9)
10: Airborne without a trace of fear, reclining in plane (5)
11: Vet theatre opening 8-down (3)
12: Complain about the horse (3)
13: A heron regrets losing its wings (5)