Lovatts, Holiday Collection, Giant Cryptic No.74

Hi i need help with these answers

18d Cast, I'm told, from one side to the other (7) th?o???
34a When its given to you free, do whatever you like! (4) r??n
36a Hired workers in March and September (5) ??n?S
72a Surveillance device on Teddy is a constant source of annoyance (7) ??g?e?s

thanks