I came to the forum looking for help with LOI 25a, and Rogissimo's first post gave me the nudge I needed to think of an alternative answer. I'd already checked dictionary for any unobvious meanings of "nick" and "bint" to pair up.
I knew the word of 27a, but like some above I'm puzzled by the parsing of 1d: how does "See" fit in?
17a was a word I had to invent and then check, New to me.
FOI was 9a. CoD perhaps the neat 11d. I had to use the Crossword Solver for a few words, like 20a, but could parse the clever clues once I had the answers.