Sun Tel prize cryptic crossword

[chokkie]

Oh boy, am I having trouble with this one. Can anyone help, please?
17a what you need to do (6) ??s??? (is it "answer"?)
24a Be subject to promises to repay without interest (9)
r?g??????
3d solder with escort perhaps, perhaps - it's none of the government's business (7,6) Private ???t?? (is it "matter", or "letter"?)
22d house briefly reflected on a disturbance (3,2)
h?? ?a

Hope somebody will be able to help. Many thanks,

[sedge47]

17a. answer
24a, incur ious
3d, private sector
22d. hoo ha

[chokkie]

Thanks so much. That sort of messes up 18d - Peak after fall in shares now capitalised. I thought it was "stopgap", but obviously not. It's 7 letters, s?o?c?p. Can you offer any ideas, please?

[sedge47]

look for a hidden word meaning (mountain) peak after a (snow) fall,

[chokkie]

Thanks a mill. Much appreciated.