Rrrobbo - here goes... 20a - anag of uranic with u as extra letter - the final a comes from "a" with a grave accent is french for from. Extra words in 1a, 16a, 26a, 34a, 41a 1d, 8d, 21d, 29d. 36d - h (heading for homework) in se from use (exercise) with u extra letter. Can't be more specific than that! Hope this helps!