13a variable grading system (7,5) --i----/---l-
15a shedding leaves annually (9) ------o--
16a take away by force (6) ----c-
21a argue over fine points (5,5) s----/-a-r-
27a ready to do as told (8) -------t
29a debatable (point) (4) --o-
43a notables of town (8) ------r-
50a in an ingratiating manner (10) ---t-o----
53a physical disorder (7) ----e--
56a superficial wound (6) -----e
60a ain't____ chaka khan song (6) --b---
62a polite social utterances (12) -----a-----s