8: Palindromic preposition
10: Sorted alphabetically (like this puzzle's clues)
11: Mountain climber's challenge
23: Microbrewery offerings
25: Heat-of-the-moment determiner
26: Cuts into small pieces
35: Former Iranian rulers
43: Studies carefully, in a way
48: Highway construction markers
51: Weather forecast, sometimes
55: The death of the party?
59: 'I'm Sorry' singer Brenda