Stuck on three:
5d. A bit of writing that may get going (8,6)
R-L-T-V-/--A-S-
17a. Thanks to Napoleon et al., a kingdom no more! (6)
-E---A
22a. You should have a minimum number of sudokus, certainly! (3)
Y-S
The answer to the last seems to be YES but I don't understand the reference to sudokus.
Any help is greatly appreciated.