Struggling with last few:
43a "They open ground for beginners" (8)
N?Y?H?T?
49d "Lock pier, but not there" (5) T?E??
assume it's TRESS but can't parse
55a "Scrub that northern film series" (5,2)
C?R?Y ?N
Assume it's CARRY ON but again can't parse
Any help greatly appreciated