I've hit a snag.
I need an R from the misprints to make FOR but the only place I can see where it goes is at 30a - but "poet's scheme" exactly matches my answer. Unless it's "To A" instead of "For A" but then that makes the F misprint in 28a wrong!
Also, at 12a I had E as a misprint as the definition in Chambers is "large planE but that messes up the first word!