Question Author
Thanks both of you.
Not sure of any combination yet.
I see the word (long) to be marked is in the last 4 lines, I think.
The three words at 12A, 16A and 40A are iffy at best for connecting with that word. One of them could be Notes and hence reference related.
The K in Koreans comes from 12 A, correct?
I have 30D as ?O?AME. So two words can be: ?o as one word and ?ame as another.
13A can be only one possible word with middle letter being O.
Will work on finding the 19th century novel next.