Lovatts Colossus #124 (Cryptic)

I have just about finished my first ever attempt at a cryptic, but need help with the last few:

35a obstinate ?o?t???y
60a cast or cast, perhaps a?o?r?
66a doctor has one nonworker d?o?y
15d arctic inhabitant overturns law right in front of us ?a?r?s
30d militia's announcement is spiteful ???i?i?u?

thanks