6d old hat- too brash to be refashioned (8)?a???o?h
7d the magna carta according to some nutty gastronomes? (4)?e??
11a isn't it all strain and pain from the time we are born? (6)l?????
12a) This one needs the old one-two to do something before 3 comes down. (5).
The answer is "idler",as in "the devil makes work for idle hands to do".
3d) Devil.