Yikes. Finally filled the grid after seemingly interminable struggle. Thanks to Vlad for the challenge, though it consumed much more of the evening than I'd have preferred...😬
5 held me up for the longest time because I was not familiar with the term. FOI 6, LOI 24.
Have to go with 11 as COD, with 14 runner-up. Too many good clues to enumerate, really brilliant with tricky disguised/hidden definitions.