Possible Clues:

• Quickly dump the others in the river
• Under the hay, by the sound of it, one might find something from the magician with this
• Very fast (mus.)
• Seems what's left in the river
• hey......,cries the magician
• After 27 across, this sort of poster is for the magician
• Very fast the hay followed it for the magician
• Sauce right inside 29? On the contrary
• Magical utterance
• Tear up poster very quickly