I can't get started today, so a few answers might open it up for me, please!
10a: Horse carried me to some hot stuff (7)
8d: All day from one to twelve (5,3,5)
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9d: Point arsonist out during process of interchanging (13)???????C????N
15a: One in a hurry to give you a horse (6,7) ????N? ???????
Explanation would also be greatly appreciated, thank you.
Granny