11 Across - "Seasonal part given to Miss Stone" - the answer is GIRASOL, but I can't fully parse it.
Also, 24 Across - "Legend shot and killed last August" (5)
I have G-A-D but haven't yet worked this one out.
Thanks, Cerasus - that's clear enough - I think I've just worked the other one out as GRAND, which is LEG END (G)
+ SHOT (RAN) + KILLED LAST (D) to get GRAND (AUGUST) - very convoluted!