18d) Solicit a court to protect firms (6) ?????T
20a) ...opposite country that's not united, guarding a king (8) ????R?R?
21d) Translate Roman Latin as usual (6) ????A?
22a) Top musician's 6 tours sadly come to nothing (8) ?I???O??
24a) Improve appearance of churchman and a politician (6) ????M?
All help much appreciated