Tough to get going. I'm at a loss for the final (in clue order) one of the 5 thematic ones. I have all checking letters, but Chambers, Collins, Mr google all lack a corroborating definition. It would help if I could solve the clue, of course ...
I've gone for the flower sunray (it's also Greek for 'star' I think) the wordplay works ok - 3 letters for 'upset' (we see it a lot in crosswords) + 'queen' =R