I'm quite sure of the answer to 1d, but have no idea of the parsing! It's a word I've seen several times in crosswords. Don't want to say more (spoilers)...
FOI 2, LOI 16.
COD 26 over 1a.
Thanks to Everyman.
Didn't have a lot of trouble otherwise, about average in difficulty for Everyman aside from the pesky 1d.
I see the rhyming pair and an alliteration. The only "first letters" clue I noticed is short and perhaps overly easy/obvious.