10: Step over the line, perhaps
23: Tenth wedding anniversary gift
27: First two-time, and first female, Nobelist
28: Checkroom employees, e.g.
29: Worrisome engine noise
38: Not in an abundant manner
42: Beethoven's 'Appassionata' et al.
44: Helios, to the Romans
47: ___ one's time (waits)
55: Budgets make them meet