I had a lot of trouble with this, took longer than the Prize.
1a (good clue, but I just had trouble), 9 (the same trick almost got me last week and I clearly didn't learn) and 8 (not a great clue IMO) caused the difficulties.
Forgot to write down FOI or LOI.
COD 1a.
Don't see anything like rhyming pair or alliteration. Two long symmetrically located across clues involved colours, which might be significant.
Lucertola, I'm cutting down on thread posting. Prefer Brendan to start the Prize thread and for others to kick off Everyman.