Just one unsolved ... or unparsed if the definition is very loose: 22d.
I have 3 crossers, and I gatger that it starts with a US state, which offers 4 options; for one I can find 4th and 6th letters to make a word which could just about be stretched to means "heads off", but I can't parse it.
FOI: 10a
LOI: 22d
COD: 18 perhaps: elegant, and escaped me until I read a hint here!