The NE quadrant crossing answers 5, 6, 8 and 10 held me up forever and I nearly threw in the towel.
Wordplay for 10 was clear, but a word new to me that required Google.
5 is a rare word, I vaguely recalled the last 3 letters and then was able to figure it the rest.
Stalled out on 8, which wound up LOI, because I became fixated on the wrong (I.) Murdoch.
6 was probably the most time-consuming clue. I also fixated on ACE for a while but gave up...by the final stages I was wondering why an obvious expected 3-letter special insert hadn't yet occurred...and that cracked it!
I should thank Boatman again for the puzzle. It gives a much better impression the morning after.