Manic Mary and Orson
"When one becomes two" as happened last Sunday we all lose one thing. Looking at the grid and number of letters given at the end of each clue, it seems that each entry is missing one letter. It eventually emerges, when you have solved a few, that one missing letter recurs throughout.
3Ac. Definition MANLY= MAC(?)O. From wordplay OC C AM reversed, there is an additional letter which gives you the first of the 31.
41Dn is (?)IKE+R, with the definition being the last word of the clue.
I'd be happy to help with more specific questions
stuarttiffin@yahoo.com