Cannot finish this and stuck here,
19d.water for aquatic mammal and duck going to Switzerland(3,4)S?? ?O?H
15a.Gas supporting sheet of glass(7)P?O?A?? that is if 16 d. is ASIA MINOR?
8d.something boiled dryin Leek possibly(6)?e?t??
23a.American writer sent back novel(4) is this AMIS, thought he was British?
Hope you can help and explain!