Thanks to Crucible for this week's Prize. I enjoyed it, high level of cluing, solid Prize entry but not the very highest level of Prize inspiration IMO. Near median level of difficulty, perhaps slightly easy, though several clues required considerable thought to parse.
One long anagram in both across and down, which might help get started.
FOI 4, LOI 22.
I lack the GK for 6 and 22, but got the former from crossers and the latter from parsing.
Co-COD 5, 7, 20 and 3, can't choose between them. 1d has a tricky misdirect that took a while to figure out. About eight more clues (omitted) on the long list.
If there's a theme, I missed it...9 and 15 share an element, as do 14 a/d and arguably (9, 16 and 19), but seemingly not sufficient for theme(s). The grid looks favorable for Ninas, but nothing there either.