Finished, but can't work out all the wordplay in these clues -
1a, 9a Forbidden city artist's a blank slate (6,4): I understand the second part of the solution but how do the first two words of the clue work?
22a, 25a Fools one politician hired, working on board (10): does "on board" indicate "S........S"? This seems a little obtuse. Or am I missing something?
26a Kind of brown-backed flower (6): can't see how the back half of the solution works
Can anyone give me a clue? Many thanks