Each clue leads to two solutions beginning with the letter indicated, which are to be entered in the grid, jigsaw-wise. One of each pair is of a kind, not further defined.
A: To adapt to new conditions, a mountaineer reportedly prepared site of some classical revolutionary. One ans is 11 letters, the other is 4 letters
N: Wild women working at crescent destroyed cairns - fishy. (3,4( and (9)
Don't put the N words where you think they go, doesn't work with the 12 letter C word. I am led to believe there's a typo and B should be 7:9 and not the given 8:8, Broteas being the thematic part.