I have a couple left that refused to be solved:
19D Exclusive group sitting upright (6) I have .e.a.t. I want to put select in but the a in crosser from 28A seems to parse ok.
56D car backing up a little. (6) I have .a.s.n
Any strong hints to wrap it up very welcome.
For the first one you need to insert one of the abbreviations for an obscure term from heraldry.
For the second you place another abbreviation under an inversion of a word for "a little bit". The answer is a brand name of a motor vehicle
19D was my last one in too. I think the shorter answers are hard in these sort of puzzles - the wordplay in the clue itself is only giving you two or (in this case) three letters, which feels counterintuitive.
Getting there slowly, but bewildered by 64ac - I have K-O--, I'm assuming a small shop? But then what does that make 48d (-I-S---E) ?
Also a hint on 1d would be most appreciated - I have F----.